BIO 1408/09 PKG W/LS CODE
BIO 1408/09 PKG W/LS CODE
5th Edition
ISBN: 9781260370829
Author: Mader
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 23, Problem 2TC

Explain why the evolution of the four-chambered heart was critical for the development of an endothermic lifestyle (the generation of internal heat) in birds and mammals.

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In the evolution of circulatory systems, how is a two-circuit circulatory system (such as that found in frogs) advantageous compared to a single-circuit circulatory system (such as that found in fishes)?
Explain the effect that decreasing temperature had on the frog heart. How do you think the human heart would respond? Explain the effect that increasing temperature had on the frog heart. How do you think the human heart would respond? Why Ringer’s solution is required to maintain heart contractions?
Explain the origin and conduction of the excitation that leads to a heart contraction. Why is the vertebrate heart said to be myogenic? If the heart is myogenic, how do you account for alterations in rate of the heartbeat?
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