Mammals and birds evolved from different reptilian lineages (therapsid reptiles and saurischian dinosaurs, respectively). Most reptilian hearts have three chambers (2 atria and 1 ventricle), yet the heart of both mammals and birds have four chambers. Explain how these two groups ended up with similar structures. Explain the evolutionary advantage of a four-chambered heart.

Mammals and birds evolved from different reptilian lineages (therapsid reptiles and saurischian dinosaurs, respectively). Most reptilian hearts have three chambers (2 atria and 1 ventricle), yet the heart of both mammals and birds have four chambers. Explain how these two groups ended up with similar structures. Explain the evolutionary advantage of a four-chambered heart.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section: Chapter Questions

Problem 11RE

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