Why is a two-chambered heart sufficient for a fish but not for a giraffe
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Why is a two-chambered heart sufficient for a fish but not for a giraffe

[From: ] [author: ] [Date: 12-04-21] [Hit: ]
-A fish doesnt have to pump blood thirty feet up to its head-Smaller body, less complex network of veins.......
The more primitive body plan of the fish does not have internal lungs to support. Amphibians which are half-fway between aquatic and terrestrial animals have 3-chambered heart, but once the Oxygen exchange is entirely depenedent upon internal lungs an additional chamber and dedicated circuit is required.

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Fish require less oxygen in their bloodstream to survive than your typical mammal, also they don't have the long neck which needs a much more efficient pump to force the blood to circulate through it.

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A fish doesn't have to pump blood thirty feet up to its head

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Smaller body, less complex network of veins.
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