- It is necessary to prevent poissioning of the body cell by accumulated excreting product e.g Urina
- It ensures a fairly constant amount of materials in the body.
EXCRETORY ORGANS IN MAN AND COMPOUNDS EXCRETED
|
EXCRETORY ORGAN
|
COMPOUNDS EXCRETED
|
|
Kidneys
|
Urea, uric acid, nitrogenous waste, salt, water in urine
|
|
Lungs
|
CO2, water, heat, salt
|
|
Skin
|
Urea, water, salt, lactic acid; heat in sweat
|
|
Liver
|
Bile pigment and urea
|
EXCRETORY PRODUCT IN MAMMALS
|
PRODUCT
|
ORIGIN
|
METHOD OF ELIMINATION
|
|
CO2
|
Produce during respiration
|
Excreted by the lungs
|
|
Bile Pigment
|
Produce by the breakdown of hemoglobin in the liver
|
Excreted in the faeces during egestion
|
|
Urea
|
Produce by the breakdown of excess protein in the liver
|
Excreted by kidneys in urine
|
EXCRETORY PRODUCT IN PLANT
|
EXCRETORY PRODUCT
|
ORIGIN
|
METHOD OF ELIMINATION
|
|
Water
|
Obtain from the soil and chemical reaction in cells
|
Transpiration
|
|
Oxygen
|
Produced during photosynthesis
|
Diffusion through the stomata
|
|
CO2
|
Produce during respiration
|
Diffusion through the stomata
|
|
Mineral salt
|
Come in with soil water
|
Stored in plant body and get use when those plant drop off
|
(diagram of the urinary system in man)
