the role of blood 1. blood delivers digested nutrients from fats, proteins, and carbohydrates to...
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The Role Of Blood
1. Blood delivers digested nutrients from fats, proteins, and carbohydrates to all body cells.
2. Blood delivers oxygen to all body cells.
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Blood Functions
3. Blood delivers chemical messengers to some body cells.
4. Blood delivers water, minerals and vitamins to cells
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Pick Up Jobs Of Blood
1. Blood picks up carbon dioxide waste from cells and carries it to the lungs.
2. Blood picks up chemical waste from cells and carries it to the kidneys.
3. Blood moves excess heat into the skin.
4. Helps to fight diseases
5. Helps stop bleeding
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Assignment
Questions 1, 2, 3 page 245
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Parts Of The Human Blood
Plasma Red blood cells White blood cells Platelets We will discuss the roles of each of these
parts in the following slides
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PLASMA
Plasma is the nonliving, yellow part of blood
Blood plasma is 92% water
The remaining 8% is made up of blood proteins
Nutrients Salts Waste chemicals Most of the pickup and
delivery is carried out by the plasma
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RED BLOOD CELLS
Red blood cells are cells in the blood that carry oxygen to the body tissues
Make up most of the blood
There are about 5 million red blood cells in a drop of blood
Red blood are the living portion of blood
Give the red color to blood
Are round, thin centers and wide edges
Life span 120 days Made in bone marrow
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ROLES OF RED BLOOD CELLS
Deliver oxygen to all body cells, oxygen is picked up by RBCs in the lungs, carried by the plasma to all parts of the body
RBC contain hemoglobin(protein) which makes carrying oxygen possible
Hemoglobin contains the mineral iron
Low RBC count can cause anemia which makes a person tired and weak and short of breath
Caused by too little oxygen reaching body cells
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WHITE BLOOD CELLS
Cells in blood that destroy harmful microbes, remove dead cells and make proteins that help prevent disease
Part of the living portion of blood
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Have a nucleus Are larger than RBCs Live for months, or
years Most though have a life
span of 10 days Healthy person has
8000 in a drop of blood
WBCs are made in in the spleen, thymus gland, and tonsils
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ROLES OF WHITE BLOOD CELLS
WBCs attack and destroy bacteria at the point of infection
WBCs also destroy or “eat” dead cells
fig. 12-6
Assignment Research the disease
Leukemia, and hand in a short presentation of the disease
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PLATELETS
Living part of the blood Platelets are cell parts that
aid in forming blood clots. Are not complete cells Smaller than RBCs Drop of blood contains
250,000 platelets
Life span, about 5 days Made in the bone
marrow Assignment Research hemophilia
and present the particulars of the disease
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ASSIGNMENT
Page 252 questions 6, 7, 8
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BLOOD TYPES
There are different types or kinds of blood You will given blood usually by a person
who has the same type as you If the wrong type of blood is given serious
problems, even death can occur.
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BLOOD TYPES
There are four main blood types
A, B, AB, O The difference is due to
the proteins found on the RBC and in the plasma
Refer to the transparency master found in your handouts
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MIXING BLOOD TYPES
Red cell and plasma proteins have different shapes
Type AB and type B blood
cannot be mixed
Proteins in the plasma of type A blood fit like puzzle pieces into the RBC protein shape of type B blood
These types will mix and form clumps that cannot move the capillaries
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ASSIGNMENT
Page 255 questions 11, 12, 13
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HOW THE IMMUNE SYSTEM WORKS
Prevents microbes from entering the body
Makes chemicals or cells that destroy microbes
Skin, mucus, tears in eyes
Antibodies, white blood cells
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Antibodies are chemicals that help destroy bacteria or viruses that enter our bodies
Antigens are foreign substances, usually proteins, that invade the body and cause diseases
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WBC make numerous antibodies, but the antibody must fit with the antigen shape in order to be killed. They must fit together like lock and key.Fig. 12-13 pg. 257
Each virus or bacteria had a different antigen on its surface. When the correct shape is found, the body makes more WBC in that shape, their job is to prevent future disease caused by the virus or bacteria
If the same disease enters your body in the future, WBC will be made to fight the disease
These antibodies will stay in your bloodstream for days to years
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ASSIGNMENT
Choose one of the following diseases Diphtheria, Tetanus, Pertussis, Polio, Measles, Rubella,
Mumps 1. Is it a virus or bacteria 2. What happens to your body when you have the disease 3. Is there a vaccine for the disease 4. Please add some statistics concerning you disease. Page 259 questions 16, 17, 18