Transport System of Organisms
Transport System of Organisms
Problems faced by Multicellular Organisms:
a)Big size-the total surface area to volume (TSA/V) is decreased . Rate of diffusion of substances into and out of all body cells is low.
b)Cells are often located far away from the external surface of the body.
How multicellular organism overcome these problem?
a)Have specialized structure to increase the surface area for the exchange of respiration gases.
b)Have transport system to get gases respiration in and out of tissue and to take excretory waste/urea from the liver to the kidney and skin.
c)Have digestive system to bring in food from surroundings into alimentary canal , digest and absorb into small intestine. Digested food are then transported to the body cells through blood and lymphatic system.
Unicellular Organisms
a)Have small size-the TSA/V is big.Exchange of substances between organism and surrounding occurs easily.
b)Body cells is directly in contact with surroundings.No need specific organ for gas exchange.
c)Transport system not required as gases exchange can takes place by plasma membrane.Excretory waste are directly eliminated from cells to surroundings through the cell membrane.
d)Does not need digestive system because food is directly taken in from surrounding through plasma membrane by phagocytosis then digested by intracellular enzyme in food vacuole.
Circulatory System
The circulatory system helps organism in :
a) delivering nutrients and oxygen to cells
b) carrying carbon dioxide , CO2 and waste products away from the cells.
c) protecting the body from infections.
The circulatory system includes three components.
Components of circulatory system:
a)Medium of transport/Blood -Blood(plasma , blood cells and platelets) for animals -Haemolymph for invertebrates.
b)Blood vessels: - arteries - capillaries - veins
c)Heart -Functions as a muscular pump -It creates the pressure that forces the blood through the blood
Problems faced by Multicellular Organisms:
a)Big size-the total surface area to volume (TSA/V) is decreased . Rate of diffusion of substances into and out of all body cells is low.
b)Cells are often located far away from the external surface of the body.
How multicellular organism overcome these problem?
a)Have specialized structure to increase the surface area for the exchange of respiration gases.
b)Have transport system to get gases respiration in and out of tissue and to take excretory waste/urea from the liver to the kidney and skin.
c)Have digestive system to bring in food from surroundings into alimentary canal , digest and absorb into small intestine. Digested food are then transported to the body cells through blood and lymphatic system.
Unicellular Organisms
a)Have small size-the TSA/V is big.Exchange of substances between organism and surrounding occurs easily.
b)Body cells is directly in contact with surroundings.No need specific organ for gas exchange.
c)Transport system not required as gases exchange can takes place by plasma membrane.Excretory waste are directly eliminated from cells to surroundings through the cell membrane.
d)Does not need digestive system because food is directly taken in from surrounding through plasma membrane by phagocytosis then digested by intracellular enzyme in food vacuole.
Circulatory System
The circulatory system helps organism in :
a) delivering nutrients and oxygen to cells
b) carrying carbon dioxide , CO2 and waste products away from the cells.
c) protecting the body from infections.
The circulatory system includes three components.
Components of circulatory system:
a)Medium of transport/Blood -Blood(plasma , blood cells and platelets) for animals -Haemolymph for invertebrates.
b)Blood vessels: - arteries - capillaries - veins
c)Heart -Functions as a muscular pump -It creates the pressure that forces the blood through the blood