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Transport in Animals
The Circulatory System

Multicellular organisms need a transport system as they cannot use direct diffusion
and have a large number of cells that all respire quickly so need a constant supply of
glucose and oxygen.
Single/Double circulatory system ­ Blood passes through the heart once/twice for

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Tissue fluid ­ This surrounds cells, it is made from substances that leave the blood (e.g. oxygen, nutrients or water). Cells
take in oxygen and nutrients from tissue fluid and release metabolic waste into.
Pressure filtration ­ Near the artery the hydrostatic pressure is greater than the pressure in the…


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