When researchers first discovered that airflow through a bird’s paleopulmonal parabronchi is unidirectional, the question arose as to whether gas exchange is countercurrent, cocurrent, or cross- current. Some ingenious investigators carried out experiments in which they measured the efficiency of gas exchange between air and blood in duck lungs when parabronchial airflow was in its normal direction and when the direction of parabronchial airflow was artificially reversed. The efficiency did not change. How is this evidence against countercurrent and cocurrent gas exchange? How is this evidence for cross-current exchange?
When researchers first discovered that airflow through a bird’s paleopulmonal parabronchi is unidirectional, the question arose as to whether gas exchange is countercurrent, cocurrent, or cross- current. Some ingenious investigators carried out experiments in which they measured the efficiency of gas exchange between air and blood in duck lungs when parabronchial airflow was in its normal direction and when the direction of parabronchial airflow was artificially reversed. The efficiency did not change. How is this evidence against countercurrent and cocurrent gas exchange? How is this evidence for cross-current exchange?
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter13: The Respiratory System
Section: Chapter Questions
Problem 1TAHL
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When researchers first discovered that airflow through a bird’s
paleopulmonal parabronchi is unidirectional, the question arose
as to whether gas exchange is countercurrent, cocurrent, or cross-
current. Some ingenious investigators carried out experiments in
which they measured the efficiency of gas exchange between air
and blood in duck lungs when parabronchial airflow was in its
normal direction and when the direction of parabronchial airflow
was artificially reversed. The efficiency did not change. How is
this evidence against countercurrent and cocurrent gas exchange?
How is this evidence for cross-current exchange?
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