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Why are transport systems needed?
1) To supply Oxygen and Nutrients
2) To remove Waste products
Why is there a need for specialised transport systems for multicellular organisms?
The bigger the organism, the greater the diffusion pathway. Without specialised transport systems, diffusion will occur but at too slow of a rate for the organism to survive
Specialised transport systems are needed due to ?
1) Meet high metabolic demands of multicellular organism
2) SA:V ratio gets smaller as multicellular organism gets bigger; so SA decreases and diffusion pathway increases
3)Production of molecules (hormones/enzymes) made in a 1 location yet needed in another
4) Waste product removed and transported to excretory glands
Specialised transport systems (circulatory system) carries ……. around the body?
Oxygen
Carbon dioxide
Nutrients
Waste products
Hormones
Circulatory system features:
1) Blood (liquid transport medium)
2) Vessels to carry transport medium
3) Pumping mechanism to move fluid around system
Open circulatory system
Closed circulatory system
Single closed circulatory system
Double closed circulatory system
Note 
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