Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 48.1, Problem 2R
Summary Introduction
To review:
The two components of Fick’s law that are responsible to satisfy the oxygen demand of
Introduction:
Diffusion is described as the movement of molecules from a higher concentration to lower concentrations. The movement of the molecules is dependent on certain factors, the relation of which is shown by Fick’s law of diffusion. According to Fick’s law of diffusion (Q = DA = P1 − P2L), the diffusion across membranes depends upon the area, partial pressures of gases, and on path length.
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QUESTION 6
Mammalian lungs are very different in structure compared to amphibian lungs. The lungs of mammals have highly complex branching patterns of
airways. The lungs of amphibians are simpler and more sac-like. Over all, the lungs of mammals are capable of much greater rates of gas
exchange compared to amphibians. Why is this?
O The more complex structure provides more surface area across which gas exchange can occur.
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QUESTION 7
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How do flatworms accomplish gas exchange (obtain oxygen and get rid of carbon dioxide)? What physical feature of flatworms enables them to survive using this method of gas exchange?
Chapter 48 Solutions
Life: The Science of Biology
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