MUSCLE
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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HR increases, SV decreases and cardiac output increases
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HR decreases, SV increases and cardiac output increases
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HR increases, SV increases and cardiac output decreases
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HR increases, SV increases and cardiac output increases
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Detailed explanation-1: -Heart rate (HR) also affects SV. Changes in HR alone inversely affects SV. However, SV can increase when there is an increase in HR (during exercise for example) when other mechanisms are activated, but when these mechanisms fail, SV cannot be maintained during an elevated HR.
Detailed explanation-2: -Cardiac output is the product of heart rate (HR) and stroke volume (SV) and is measured in liters per minute. HR is most commonly defined as the number of times the heart beats in one minute. SV is the volume of blood ejected during ventricular contraction or for each stroke of the heart.
Detailed explanation-3: -The short term effects of exercise on the cardiovascular system: Increase in heart rate. Increase in stroke volume. Increase in cardiac output.