Vertebrate cardiovascular systems reflect evolution. A fishs two-chambered heart pumps
Chapter 23, Problem 23.2(choose chapter or problem)
Vertebrate cardiovascular systems reflect evolution. A fishs two-chambered heart pumps blood in a single circuit. Land vertebrates have double circulation with a pulmonary and a systemic circuit. Amphibians and many reptiles have three-chambered hearts; birds and mammals have four-chambered hearts.
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