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A-Level Biology OCR A

Transport Medium Haemolymph Open Circulatory Diffusion Describe Features

Front Describe the features of open circulatory systems.
Back Open circulatory systems:
  • Very few vessels to contain transport medium
  • Transport medium (haemolymph) pumped from heart into the body cavity (haemocoel) of animal
  • Transport medium comes into direct contact with tissues and cells (where exchange takes place) & is at low pressure
  • In insects haemolymph does not carry gases
  • Haemolymph does circulate but steep diffusion gradients cannot be maintained for efficient diffusion

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