sciencesciencechap 3 : chap 3 : excretionexcretion

sciencesciencechap 3 : chap 3 : excretionexcretion

Name : Siti Nur Syukria Bt SufakhiName : Siti Nur Syukria Bt SufakhiClass : 3 RafflesiaClass : 3 Rafflesia

Teacher : Pn. NormarihaTeacher : Pn. Normariha

Human excretion

Carbon dioaxide and

water

Lungs

Water, Urea and mineral

salts

Kidney

Skin

* Cortex*Medulla*Pelvis

Urinary bladder

*Sweat gland

*Sweat pores

eliminate

throughthrough

Excretory System• Excreation is a process of removing substances

that are of no use or in excess from body.

• Human excretory organs are SKIN, LUNGS and KIDNEYS.

• If excretory products like urea, carbon dioxide, excess mineral salts and excess water are allowed to accumulate in the body, it will become poisonuis (toxic) and endanger health.

EXCRETORY ORGANSExcretory Method SWEATING

1)The sweat glands absorbs excretory product from blood capillaries around it.

2)Sweat is eliminated from the sweat gland through sweat pores to the surface of the skin.

Excretory Products Water + Mineral Salts + Urea Sweat

Excretory Method RESPIRATION1)Carbon dioxide in the

blood capillaries diffuses into the alveolus and is eliminated from the lungs when exhaling.

2)Water is eliminated from the lungs in the form of water vapour.

Excretory Products Water and Carbon dioxide

EXCRETORY ORGANS

EXCRETORY ORGANSExcretory Method URINATION.

1)Excretory products are carried by the blood to the kidney and then eliminated as urine.

**Kidney eliminated many substances in large quantities.

Excretory Products Water, Urea and excess Mineral Salts.

URINARY SYSTEM

1) The urinarry system is part ofexcretory system.

2)The uninary system cosists of : a)a pair of kidneys b)a urinary bladder c)a pair of ureters

d)urethra3) The blood carried by therenal artery to the kidney is

filtered and excretory productsare the eliminated from the

blood as urine.

HUMAN KIDNEYS1) The kidneys are situated to the left

and right back section of theabdominal cavity.

2)Human kidneys are dark red incolour and is bean-shaped.

3)The outer part which is dark red incolour named cortex

4)The inner part which is light red incolour named medulla

5)The pelvis is the part where theureter begin.

HUMAN KIDNEYSORGANS FUNCTION

UreterChannels urine from the kidneys to the urinary bladder

Urinary Bladder Stores urine

Urethra

Channels urine from the urinary bladder out of the body

Renal Artery

Transports oxygenated blood to the kidneys

Renal Vein

Transports deoxygenated blood away from the kidneys

HUMAN KIDNEYS• Functions of kidneys : a)eliminating excess water and the mineral salts in the body b)regulating the amount of water and mineral salts in the body. c)regulating the blood concentration. d)helping to removes nitrogenous substances like urea and uric acid from

the body

The importance of maintaining a healthy kidney

• Under normal conditions, substances like protein(amino acids) and glucose are not found in the urine.If glucose is found in the urine, it is most likely the person has diabetes.

• If kidneys do not function properly, toxic substances in the blood will accumulate and this will lead to death.

• The kidney will function properly if we : a)drink a lot of clean water. b)avoid drinking alcohol. c)reduce drinking gassy drinks. d)reduce eating food with high sugar content

PLANT EXCREATION

Carbon dioxide,

oxygen and water

Leaf Stomata

Water, urea and mineral

salts

Tree Stem

Bark

Quinine and

tannin

eliminate

throughthrough through

excretion in plants• Plants do not have a specific excretory system.• Respiration in plants eliminates carbon dioxide

and water.• Photosynthesis eliminates excess water nfrom

plants.• Complex excretory products gather on LEAVES,

FLOWERS, BARK, STEMS, FRUIT etc. to be dropped or eliminated.

• Some excretory products of plants are beneficial while some are dangerouse to humans.

• Some beneficial excretory products of the plants can endanger human heatlh if misused.

Beneficial Excretory Products Of Plants And

Their UsesEXCRETORY PRODUCT SOURCE USE

Latex Rubber tree To make vehicle tyres

ResinCertain tree stems like the casuarina tree To make varnish and gum

GumCertain tree stems like the acacia tree To make cough madicine

Acid (tannic acids or tannin)

Bark of plants like the tea, coffee and mangrove tree To make ink

Quinine Bark of cinchona tree To make to treat malaria

OilFlowers or leaves of certain trees

To make perfume and ointment for insect bites

Excretory Products Of Plants That Dangerous To Humans

EXCRETORY PRODUCT SOURCE USE

Latex Rubber tree To make vehicle tyres

Resin

Certain tree stems like the casuarina tree To make varnish and gum

GumCertain tree stems like the acacia tree To make cough madicine

Acid (tannic acids or tannin)

Bark of plants like the tea, coffee and mangrove tree To make ink

QuinineBark of cinchona tree To make to treat malaria

OilFlowers or leaves of certain trees

To make perfume and ointment fot insect bites