A-Level Biology OCR A
Organisms Mass Large Features Circulatory Transport Medium Multicellular
| Front |
Describe the general features of circulatory systems and explain why organisms need mass flow. |
| Back |
Features of circulatory systems:- Liquid transport medium that circulates around the system
- Vessels that carry the transport medium
- Pumping mechanism to move fluid around the system
Mass flow: - Large multicellular organisms need mass flow because it delivers oxygen and food to cells in the body a lot more rapidly than diffusion does
- Large quantities of oxygen and food are able to be moved at once which is important because large multicellular organisms are highly metabolically active
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A-Level Biology OCR A