In a healthy heart during exercise, cardiac output increases as heart rate increases up to about 120bpm, as stroke volume remains constant (CO = HR x SV). As heart rate goes further up, the cardiac output remains stable, and above 160bm it decreases. Why does it decrease? A. shorter filling time decreases stroke volume B. venous return decreases C. valves cannot open and close fast enough D. contractile power of heart muscle cells increases
In a healthy heart during exercise, cardiac output increases as heart rate increases up to about 120bpm, as stroke volume remains constant (CO = HR x SV). As heart rate goes further up, the cardiac output remains stable, and above 160bm it decreases. Why does it decrease? A. shorter filling time decreases stroke volume B. venous return decreases C. valves cannot open and close fast enough D. contractile power of heart muscle cells increases
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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In a healthy heart during exercise, cardiac output increases as heart rate increases up to about 120bpm, as stroke volume remains constant (CO = HR x SV). As heart rate goes further up, the cardiac output remains stable, and above 160bm it decreases. Why does it decrease?
- A. shorter filling time decreases stroke volume
- B. venous return decreases
- C. valves cannot open and close fast enough
- D. contractile power of heart muscle cells increases
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