circulation system and organisms

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Last updated 5:45 PM on 4/28/26
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4 Terms

1
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Why do we need a circulation system?

We need a circulatory system because diffusion alone is far too slow to supply all cells in a large body.

2
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Fish

Blood goes through heart once

  • Heart → gills → body → heart

👉 Works because fish are small and live in water
❌ Not very efficient

3
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Birds & mammals

  • Blood goes through heart twice

  • Heart → lungs → heart → body

👉 Very efficient
✔ separate blood (best oxygen supply)
✔ supports high energy activity

4
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Amphibians

  • Blood goes through heart twice

  • Heart → lungs/skin → heart → body

👉 More efficient than fish
❌ Some mixing of blood