when do organisms need transport systems? we need transport when 2 cells are far from each other...
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When do Organisms When do Organisms need Transport need Transport
Systems?Systems? We need TRANSPORT when
2 cells are far from each other
materials needed to be moved
from one place to another
huge sum of substances to be
moved
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Why do Organisms need Why do Organisms need Transport Systems?Transport Systems?
ensure a continual supply of nutrients,
oxygen and other useful materials for
metabolism and removal of toxic waste
products produced by metabolism
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small animal can undergo this by
diffusion but large animal cannot,
they need a transport system
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Blood ComponentsBlood Components
blood cells include red blood cell
(erythrocytes), white blood cells
(leucocytes ) and blood platelets where
red blood cells are the most numerous
blood cells and give blood the red colour
(straw-coloured fluid)
(corpuscles)blood = plasma + blood cells
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Separation of bloodSeparation of bloodBlood components can be separated by centrifuge
A Centrifuge for
separationBlood cells
Plasma
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Composition of Composition of Mammalian BloodMammalian Blood
Plasma (55% by volume)
Blood Cell (45% by volume)
Whole Blood
White Blood Cell
Red Blood Cell
Platelets10% Dissolved Substances
90 % Water
Phagocytes
Lymphocytes
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Blood PlasmaBlood Plasma
Plasma is approximately 55% by volume and containsWATER (as a solvent)SOLUBLE SUBSTANCES
mineral salts
protein
dissolved food substances metabolic wastes
hormones gases
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Blood CellsBlood Cells
Platelets
White Blood Cell
Red Blood Cell
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Red Blood Cells Red Blood Cells (red corpuscles, (red corpuscles,
erythrocytes)erythrocytes) form within bone marrow
short life span with about 120 days old red blood cells are destroyed in liver & spleen
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they have no nuclei when mature
- it increases the space to carry
haemoglobin
they have biconcave disc shape
- which provides large surface area
to diffuse oxygen
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possess of haemoglobin
– enable red blood cell to carry oxygen
from lungs to all parts of the body
– haemoglobin is an iron-containing
compound and its presence is
responsible for the colour of red blood
cell
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Red blood cells
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Transport of OxygenTransport of Oxygen
haemoglobin has a high affinity for oxygen when the concentration of oxygen is high
Oxygen + haemoglobin
oxyhaemoglobin
In lung
In tissue
change of haemoglobin to oxyhaemoglobin is accompanied by the colour change from purplish red to bright red
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Transport of Carbon Transport of Carbon DioxideDioxide CO2
(from tissue)CO2
(in bloodstream)
CO2 + H2O
H+ + HCO3-
hydrogen- carbonate
ion
HCO3-
(in plasma)
H2CO3
carbonic acid
enzyme
(In red blood cell)
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To Test a Sample of To Test a Sample of Blood Plasma Blood Plasma
(chicken/pig/ox) for (chicken/pig/ox) for glucoseglucose
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Name the supernatant obtained after centrifugation.
Ans: It is plasma.
centrifuge
chicken blood
supernatant
Fehling’s solutions A and B
boiling water
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What does the precipitate in the centrifuge tube consist of ?Ans: The precipitate contains blood cells.
centrifuge
chicken blood
supernatant
Fehling’s solutions A and B
boiling water
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What happens to the supernatant when it is heated with Fehling’s solutions A and B ?
Ans: The supernatant forms an orange precipitate.
centrifuge
chicken blood
supernatant
Fehling’s solutions A and B
boiling water
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White Blood Cells (white White Blood Cells (white corpuscles, leucocytes)corpuscles, leucocytes)larger than red blood cells
and irregular in shape
prominent nucleus
no haemoglobin
kill germs, defend against disease
two main kinds of white blood cells: phagocytes and lymphocytesRed blood cells
White blood cells
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White Blood Cells White Blood Cells - Phagocytes- Phagocytes
made in bone marrow but different from the
place where red blood cells are made
irregularly shaped nucleus
move like Amoeba
can squeeze out through the walls of
capillaries into the surrounding tissues
engulf dead cells or pathogens
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made in bone marrow, then
migrate to lymph nodes
large nucleus which nearly fills
up the cells
White Blood Cells White Blood Cells - Lymphocytes- Lymphocytes
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produce antibodies to attack germs
by reaction with their surfaces and
often cause them to clump together
produce antitoxins to neutralize the
toxins secreted by germs
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Platelets Platelets (thrombocyt(thrombocyt
es)es)platelets are not cells
fragments budded off from specialized
cells in bone marrow
smaller than other blood cells
life-span is about 5 to 9 days
agent for initializing blood clotting
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Blood ClottingBlood Clottingwhen platelets are damaged in an
injury, it releases a chemical substance
which starts a chain of reactions
results: fibrinogen
fibrin
fibrin acts like a net, trapping blood cells
and plugging the wound so bleeding stops
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when new skin formed
under the scab, it loosens
and comes off
The clotting of blood
(plasma protein)
serum are yellowish fluid which
is plasma without fibrinogen
clot dries up and harden to form a
scab
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Functions of BloodFunctions of Blood It acts as a transport medium for oxygen,
carbon dioxide, food, urea, hormones,
antibodies and heat
It contains white blood cells and platelets for
body defense against infection
It helps in maintaining body temperature
constant
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In emergencies an injured person may die...
How can we save his life?
Blood TransfusionBlood Transfusion
Any criteria for Blood Transfusion?
Donor’s blood and recipient’s blood must be compatible, otherwise, agglutination will occur which will block the blood vessels
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Blood GroupingBlood Groupinga person’s blood group determined
by the protein present on the surface
of red blood cells called antigens
there are two different antigens
called antigen A and antigen B. For a
person in group A contains antigen A
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in human, there are mainly four
different blood groups called A, B, AB
and Oin plasma, there may contain
antibodies known as anti-A and anti-
B. They will react with certain red
blood cells which contain the wrong
antigen
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The ABO Blood GroupThe ABO Blood GroupR
ed
blo
od c
ell
Pla
sm a
Type A Type B Type AB Type OAntigen A Antigen B Neither
antigen A or B
Antigens A and B
Antibody B Antibody ANeither
antibody A and B
Antibodies A and B
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HumanHuman BloodBlood GroupsGroups
BloodGroup
Antigen(RBC)
Antibodies(Plasma)
Recipient
A A Anti-B A & AB
B B Anti-A B & AB
AB A & B NO AB only
O NO Both anti-A& anti-B
ALL
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Agglutination ReactionAgglutination Reaction
Type A blood of donor
Type B antibody in type A blood of
recipient
A
B
Type A blood of donor
Type A antibody in type B blood of
recipient
No agglutination
Agglutination
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Human Blood GroupsHuman Blood Groups
AgglutinationA BDonor Recipient
AB = universal recipientO = universal donor
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Blood VesselsBlood Vessels
there are three main kinds of vessels:
arteries, veins and capillaries
arteries carry blood away from the heart while
veins carry blood towards the heart
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Blood CirculationBlood Circulation
Heart
Venule ArterioleCapillary
Vein Artery
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Blood VesselsBlood Vessels
Artery
Vein
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ArteryArtery
Artery
Arteries carry blood away from the heart and so
the blood is under high pressure
wall of arteries are
thick and supported
with muscles and
elastic fibres
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VeinVein
Vein
• Blood pressure is much lower in vein as blood has flowed slowly through the capillaries
before entering the vein
• vein has larger lumen and thinner walls than artery
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valves present to prevent backflow of blood and ensure that it flows towards the heart
Valve openblood can flow
Valve closedblood can’t flow back
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Valves closedPrevent back-flow
Muscle contracted
Blood squeezed towards heart
return of blood to heart is aided by contraction of body muscles as they squeeze the blood along the vein
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Differences between Differences between Arteries and VeinsArteries and Veins
Arterie
s
Veins
Direction
of blood
flow
carry blood
away from the
heart
return blood to
the heart
Wallthick wall made
up of muscles
and elastic
fibres
thin wall made
up of muscles
and elastic
fibres
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Differences between Differences between Arteries and VeinsArteries and Veins
Arteries
Veins
Pulse blood flows with pulse
blood flows steadily with no
pulseBlood
Pressure
blood is under high pressure
blood is under low pressure
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Differences betweenDifferences between Arteries and Veins Arteries and Veins
Arteries
Veins
Valves
possess no valves along their lengths (except the pulmonary
artery)
possess valves at intervals along their lengths to prevent
backflow of blood
Lumen small large
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Differences between Differences between Arteries and VeinsArteries and Veins
Arteries
Veins
Oxygenation of blood
Blood is oxygenated (except in pulmonary
artery)
Blood is deoxygenated
(except in pulmonary
vein)Locatio
n
deep inside the
body
close to the surface
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Demonstration of Demonstration of Venous Flow in Venous Flow in the Fore the Fore
ArmArm
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What structure in the vein is indicated by the appearance of the bulge at S shown in diagram C ?
Ans: The valve in the vein.
A
C D
B
vein
YX
SR
finger X pressing down
on R
finger Y squeezing blood towards S
finger X still pressing down
on R
finger Y removed
both fingers are removed
elbow joint
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What is the purpose of tying the arm with a piece of rubber tubing ?
Ans: This makes the vein more conspicuous.
A
C D
B
vein
YX
SR
finger X pressing down
on R
finger Y squeezing blood towards S
finger X still pressing down
on R
finger Y removed
both fingers are removed
elbow joint
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With reference to the steps shown, explain why the part of the vein between R and S has disappeared ?Ans: In step B, finger Y squeezes the vein towards point
S. Blood in this segment is therefore pushed along …
Ans: On the other hand, finger X is still pressing down on point R which prevents blood flowing into R.
A
C D
B
vein
YX
SR
finger X pressing down
on R
finger Y squeezing blood towards S
finger X still pressing down
on R
finger Y removed
both fingers are removed
elbow joint
Ans: Since there are valves at point S, blood is prevented from flowing back …
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Why is it necessary to take the rubber tubing away as soon as the demonstration has been completed ?
Ans: It is because we need to restore the normal blood flow for the arm as soon as possible.
A
C D
B
vein
YX
SR
finger X pressing down
on R
finger Y squeezing blood towards S
finger X still pressing down
on R
finger Y removed
both fingers are removed
elbow joint
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CapillariesCapillariesIt is the smallest blood vesselsIt is the site of exchange (by diffusion)
Diffusion
Thin wall (one cell) Nutrients
O2
CO2 Waste
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Adaptation of Adaptation of CapillaryCapillary It has many branches
to increase the surface area for diffusion
of materials like glucose, amino acids,
water, carbon dioxide, oxygen, mineral
salts and metabolic wastes between
blood and tissue cells
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It has thin wall (only one-cell thick)
to decrease the diffusion distance
for exchange of materials between
blood and tissue cells
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Exchange of Exchange of MaterialsMaterialsIt is carried out by diffusion through the whole
length of capillaries
O.P. O.P.
B.P.B.P.
blood flowarteriole end venule end
(B.P. > O.P.)substance pressed out
to the tissue cells
(O.P. > B.P.)substances diffused into
the blood capillary
O.P.= osmotic pressure
B.P.= blood pressure
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HeaHeartrtlocated inside the thorax,
between the lungs
enclosed by the pericardium
the wall of heart is made of
cardiac muscle and it works days
and nights throughout one’s life
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oxygen and nutrients are supplied
to heart through coronary arteries
while wastes are carried away by
coronary veins
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Structure of Structure of HeartHeartthe heart is divided into right and left
halves internally by a central wall or
partition called septum
heart is divided into four chambers
with the two chambers at the top of
heart are auricles and the two down
at the bottom called ventricles
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walls are relatively thin
right auricles receives deoxygenated blood from
the venae cavae (superior vena cava and inferior
vena cava) which collect blood from all parts of
the body except lungs
left auricle receives oxygenated blood from the
pulmonary veins which come from the lungs
Heart-Auricles Heart-Auricles (Atrium)(Atrium)
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Direction of Blood Flow Direction of Blood Flow from Auricles to from Auricles to VentriclesVentriclesRight Left
Right auricle(atrium) Left auricle
(atrium)
Left ventricle
Right ventricle
Inferior vena cava
Superior vena cava
Pulmonary veins
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Heart-VentriclesHeart-Ventricles have thicker and more muscular walls than
the auricles
right ventricle pumps deoxygenated blood
to the lungs via the pulmonary artery
left ventricles pumps oxygenated blood into
the aorta which takes the blood around the
body
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right ventricle pumps blood to the
lungs, which lie very close to the
heart but left ventricle needs to
pump blood all around the body
left ventricle has a thicker wall of muscles
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Heart-ValvesHeart-Valves prevent blood from flowing backwards,
ensuring blood flows through the heart in
only one direction
there are three types of valve present in
heart, they are : Tricuspid valve, Bicuspid
valve and Semilunar valves
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Tricuspid valve
-valve on the right hand side lying
between the right auricle
and right ventricle has three parts
Bicuspid valve
- it situates at the left hand side lying
between the left auricle and left
ventricle is made up of two parts
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REMARKS: chordae tendineae (heart tendon)
are attached between the two
valves above and the muscular
walls of the ventricles to prevent
the one-way valves from being
turned inside out
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Semilunar valves
-situated at the entrances of the
aorta and the pulmonary artery.
They are pocket- shaped
valves to prevent the backflow of
blood into the ventricles
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Aorta
Pulmonary veins
Bicuspid valve
Tricuspid valve
Venae cavae
Pulmonary arteries
- prevent valvesto turn inside out
Blood Flow from Ventricles Blood Flow from Ventricles to Other to Other parts of the Bodyparts of the Body
Semilunar valves
Ventricles Septum
Heart tendon
Cardiac muscle
Articles
To left lungTo right lung
To head
To body
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Examination of a Examination of a Pig’s Heart Pig’s Heart
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Why do the ventricles have thicker walls than the auricles ?Ans: It is because ventricles need to
pump blood to other parts of the body.
first cut
aorta
pulmonary artery
right auricle
right ventricleleft
ventricle
left auricle
pulmonary artery
right auricle left
auricle
second cutthird cut
heart tendonleft
auricle open
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Which ventricle has a thicker wall than the other ? What is the reason for this difference ?Ans: Left ventricle. As it needs to pump blood
all around the body but right ventricle pumps blood to lungs which lie close to heart.
first cut
aorta
pulmonary artery
right auricle
right ventricleleft
ventricle
left auricle
pulmonary artery
right auricle left
auricle
second cutthird cut
heart tendonleft
auricle open
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What are the structures separating the auricles and ventricles ?Ans: It is septum.
first cut
aorta
pulmonary artery
right auricle
right ventricleleft
ventricle
left auricle
pulmonary artery
right auricle left
auricle
second cutthird cut
heart tendonleft
auricle open
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Why is it necessary to have the chordae tendineae ?Ans: It is used to prevent the one-way
valves from being turned inside out.
first cut
aorta
pulmonary artery
right auricle
right ventricleleft
ventricle
left auricle
pulmonary artery
right auricle left
auricle
second cutthird cut
heart tendonleft
auricle open
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What is the function of the coronary artery ?
Ans: It is used to supply nutrients and oxygen to the heart.
first cut
aorta
pulmonary artery
right auricle
right ventricleleft
ventricle
left auricle
pulmonary artery
right auricle left
auricle
second cutthird cut
heart tendonleft
auricle open
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Heart AttackHeart Attack cardiac muscle differs from other kinds
of muscle as it is able to contract
repeatedly without getting tired
coronary arteries are branches from
aorta which supply nutrients and
oxygen to the cardiac muscle
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coronary heart disease is the slow down
of the flow of blood through coronary
arteries which is caused by the deposition
of a fatty substance called cholesterol on
the inside wall of these arteries, making
them narrower and rougher
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heart attack is a result of blocking
coronary arteries so cardiac muscle
cannot obtain oxygen or nutrients
from blood and die as a result, the
person may die excess animal fat in the diet,
smoking, high blood pressure, lack
of exercise and stress may lead to
heart attacks
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Heart BeatHeart Beat
as cardiac muscle in its walls contracts
and relaxes, heart beats
systole is the time when cardiac muscle
contracts and the heart becomes
smaller which squeezes blood out
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diastole is the time when cardiac
muscle relaxes and the heart becomes
larger which allow blood to flow into
the auricles and ventricles
it consists of auricular systole,
ventricular systole and diastole
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Auricular systole
- it is about 0.1 second in duration
- contraction of the two auricles,
squeezing blood into the ventricles
Ventricular systole
- it is about 0.3 second in duration
- contraction of the two ventricles
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- tricuspid and bicuspid valves are forced to close
by the pressure of the blood, producing
the
first heart
sound “lub”
- semilunar valves are forced open by the
pressure of the blood, so blood is forced
out of the ventricles into the arteries
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Diastole
- it is about 0.4 second in duration
- all four chambers relax
- blood pressure in the ventricles
decreases and this causes the
closure of the semilunar valves,
producing the second heart sound
“dup”
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Cardiac cycle is the duration between
one contraction of the auricles and
the next and it is about 0.8 seconds
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Blood Circulation Blood Circulation in Manin Man
In one complete circulation, blood flows through heart twice but flow through the body once only
consists of two circuits: pulmonary circulation and systemic circulation
body
lungs
heart
pulmonary circulation
systemic circulation
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Pulmonary CirculationPulmonary Circulation
Tissue P
ulm
onary
arte
ry
Venae cavae
Deoxygenated blood
Pulmonary vein
Oxygenated blood
Right auricle
Right ventricle
Lung
Left auricle
Left ventricle
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Systemic CirculationSystemic Circulation contraction of left ventricle
pumps oxygenated blood out of
the heart via aorta to all parts of
the body (except lungs)
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exchange of materials occurs when
blood flows through the capillaries
and become deoxygenated
finally, blood is collected by the
venae cavae which drains them into
the right auricle of the heart
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Lymphatic SystemLymphatic System
Tissue fluid
- fluid formed when the high blood
pressure at the arterial end of a
capillary forces fluid out through
it but red blood cells, platelets and
plasma proteins stay back in the
bloodstream
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- used to bath the cells and keeps
them in the right condition and
provides a medium for exchange
of materials between blood and
cells
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Lymph
- excess tissue fluid which cannot be
returned to the capillaries
by osmosis but drained into
lymph capillaries
- lymph capillaries are colourless
vessels present in the
tissues and it will join up to
form large lymph vessels
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- lymph vessels carry lymph to
subclavian veins which
empty into the heart through the
superior vena cava- lymphatic vessels contain valves, which
help to keep the lymph flowing in the
right direction
- contraction of skeletal muscles also
aids the flow of lymph
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Lymph nodes (lymph glands)
- situated on the way from the
tissue to the subclavian veins
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Lymph nodesLymph nodes
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- made up of tiny spaces like a
sponge and lymph is filtered
through these spaces before it
can continue to return to the
bloodstream - contain large numbers of white
blood cells to destroy bacteria
and toxin in lymph
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– to return excess tissue fluid to
blood system
– as a medium for material
exchange between
capillaries and tissue cells
Functions of Lymphatic Functions of Lymphatic SystemSystem
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- fats are absorbed by lacteals
which join the lymphatic system
so it transport absorbed fats
- the lymph node filters the lymph,
it also produce lymphocytes
which make antibodies
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Functions of Transport Functions of Transport System System
in Angiospermsin Angiosperms carries water and mineral salts
from the roots to the
mesophyll cells of the leaves for
photosynthesis by xylem
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xylem and phloem are together
called vascular bundles
carries foods made in the leaves
by photosynthesis to other cells
of the plant by phloem
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Arrangement of Conducting Arrangement of Conducting Tissues in AngiospermsTissues in Angiosperms
in root
- close to central position in which
xylem is found in the centre in a
star-like arrangement and
phloem lies between the radial arms
of the xylem
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in stem
- close to the epidermis where the
conducting tissues are arranged
in a ring near the outside edge, with
phloem lying outside and
xylem inside
- to resist the strong pulling force
from the wind blowing the shoot
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- to resist the strong bending force
produced by wind
in leaves
- vascular bundles are often called
veins in which xylem lies
above the phloem
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XylemXylem consists of long tubular vessels
each vessel is made up of many dead cells
which are hollow and joined end to end
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xylem vessels run from the root,
through the stem and finally branch
out into every leaf of the plant
the end walls of the cells have disappeared
and so a long and open tube is formed
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xylem vessels contain no cytoplasm
or nuclei
to prevent xylem from collapsing, they
have thick cell walls made of cellulose
and strengthened by rings of a
woody substance called lignin
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PhloemPhloem made up of tube cells called sieve tubes
which are living cells joined end to end by
perforated horizontal walls called sieve plate
the perforations allow dissolved substances to
flow through them so food made in the leaves
can be carried to other parts of the plant
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sieve tubes contain cytoplasm but
no nuclei and they do not
have lignin in their cell walls
each sieve tube has a companion cell
next to it but this companion cell
does not have nucleus and
contain many other organelles
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Comparison between Comparison between Sieve Tubes and Sieve Tubes and
VesselsVesselsSieve Tubes
Vessels
living cells dead cells
smaller diameter
larger diameter
walls relatively thin, flexible, composed of
cellulose
walls relatively thick, hard,
strengthened by rings of lignin
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Comparison between Comparison between Sieve Tubes and Sieve Tubes and
VesselsVesselsSieve Tubes
Vessels
the lumens of mature cells are
filled with cytoplasm
the lumens of mature cells are empty
end walls of adjacent sieve
tubes from sieve plates
end walls of adjacent vessels
cells break down
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Upward Transportation of Water Upward Transportation of Water and Mineral Saltsand Mineral Salts
• root pressure
• capillarity
• by transpiration pull
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Transpiration PullTranspiration Pull most of the water rising up in the xylem of the stem is pulled up by this
during transpiration, water is continually removed from the top of xylem
vessels to supply cells in the leaves so pressure at the top of xylem
reduces and water flows up
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Transport of Organic Transport of Organic NutrientsNutrients
translocation is the process of
transporting the manufactured
carbohydrates in photosynthesis via
phloem from the leaves to other parts
of the plant
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~ ~ EndEnd ~~