why would an amphibians heart not be suitable for a mammal?
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Because the amphibian heart is only 3 chambered while in case of mammals their is 4 chambered heart and also in case of amphibians there are accessory chambers present.
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For one thing, amphibians are extremely small compared to most mammals, and it wouldn’t be capable of pumping the vast volume of blood in mammals before wearing out.
Second, amphibians hearts are 3 chambered, and mammalian hearts are 4 chambered. Since mammals regulate their own body temperature, they need a more efficient system which separates the deoxygenated blood more completely from the oxygenated blood.
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