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A-Level Biology OCR A

Organisms Mass Large Features Circulatory Transport Medium Multicellular

Circulatory systems feature a transport medium, vessels, and a pump. Mass flow is crucial for large, active organisms to rapidly deliver significant amounts of oxygen and nutrients.

Circulatory systems generally have a liquid transport medium, vessels, and a pumping mechanism; mass flow is necessary for large, metabolically active organisms to rapidly deliver large quantities of oxygen and food.

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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