Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:Crocodiles are able to remain under water for more than one hour without surfacing to breathe and
often kill their prey by drowning it. Below are the plots of fraction oxygen saturation versus log pO2 for
human (upper panel) versus crocodile Hemoglobin (lower panel). The fractional saturations were
determined in the absence (open symbols) and in the presence of 5% CO2 (filled symbols). Using the
plot as basis for argument, explain why crocodiles can hold their breath so much longer than humans.
(Figure adopted from N. Hennakao Komiyama, et al. Nature 1995)
100
Human Hb
8아
6아
+ 5% CO,
Crocodile Hb
8아
60-
40
•+ 5% CO2
log pO, (mm Hg)
Oxygen saturation (%)
Oxygen saturation (%)
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