Question: The figure below shows a graded bradycardia from grey seals
(Halichoerus grypus) diving in the oc…


The figure below shows a graded bradycardia from grey seals
(Halichoerus grypus) diving in the ocean near Scotland.
Cardiac output was 9.7 L min-1 before diving (HR=119
min-1 predive) and declined 90% after 20 minutes of
submersion. What is stroke volume at 21 minutes of the dive
duration?

60 · 50 20 10 0 15 Dive duration (min) 10 20

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60 · 50 20 10 0 15 Dive duration (min) 10 20

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