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CLASS: SS2
TOPIC: TRANSPORT SYSTEM 1
CONTENT: (a) Media of transportation (i) Fluid as medium of transportation-structure and function of blood (ii) Cytoplasm in small organisms (iii) Cell sap or latex in most plants (iv) Closed and open circulation (h) Mechanism of transportation: (i) Unicellular organisms (ii) Multicellular organisms (iv)Higher animals (v) Higher plants (i) Absorption of water and mineral salt.
TRANSPORT SYSTEM
Transport system is the movement of metabolic substances from various parts of the organism where they are produced or obtained to the parts where they are either used, stored or removed from the body.
NEED FOR TRANSPORTATION
- It aids in the removal of metabolic waste e.g carbon dioxide, water and urea
- It helps to move hormones in plants and animals from where they are produced to areas of need.
- It helps transport essential materials in organisms for metabolic process e.g nutrients, oxygen and water.
- In plants, transport is necessary to move mineral salt and water from the root to the stems and leaves.
MATERIALS THAT ARE TRANSPORTED IN ANIMALS
The materials transported in animals include:
- Water
- Digested foods (vitamins, amino acids, mineral salts, fatty acids ,glycerol)
- Gases (oxygen, carbon-dioxide)
- Excretory products (urea, carbon-dioxide, excess salt)
- Hormones (adrenalin, insulin, oestrogen etc) and other materials.
- Antibodies
MATERIALS THAT ARE TRANSPORTED IN PLANTS
These include:
- Water
- Manufactured food
- Excretory products
- Hormones
- Mineral salts
- Oxygen
MEDIA OF TRANSPORTATION
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