Why the heart of shark is called as branchial heart?
Branchial hearts derive from “caval” veins, receive deoxygenated blood and pump it into the gills. What organisms have a branchial heart? In animals with lungs—amphibians, reptiles, birds, and mammals—the heart shows various stages of evolution from a single to a double pump that circulates blood (1) to the lungs and (2) to the body as…
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