PATHOLOGY MCQ
HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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All of the following observations can be seen in a person doing exercise except:
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Increase in heart rate
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Increase in cardiac output
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increase in duration of cardiac cycle
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increase in blood flow to skeletal muscles
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Explanation:
Detailed explanation-1: -The cardiac output increase is due to a large increase in heart rate and a small increase in stroke volume. The heart rate increases because of a decrease in parasympathetic activity of SA node combined with increased sympathetic activity.
Detailed explanation-2: -Definition of Homeostasis During exercise, blood pressure, pulse and respiration increase to meet the increased demand for oxygen and nutrients by your musculoskeletal system. The adjustment of vital signs to match your body’s level of physical activity is an example of homeostasis in action.
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