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Circulatory system ­ Mammals
Why do large organisms need a transport system?

Increasing size means a decrease in the SA to Volume ratio.
Can no longer rely on simple diffusion and need to develop specialist exchange
surfaces (these are linked to transport systems).

Mammals are endothermic animals with a high…

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Efficient for the level of activity of fish but not mammals ­ also fish do not maintain
their body temperature ­ need to respire relatively less compared to mammals

Double circulatory system:

Heart is composed of two separate pumps ­ right side
pumps blood to the lungs to pick up…

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