A large increase in heart rate can cause:
A) Increased blood viscosity
B) Loss of action potential
C) Decreased stroke volume
D) Reduced cardiac contractility
Ans: C
Feedback:
The time spent in diastole and filling of the ventricles becomes shorter as the heart rate increases. This leads to a decrease in stroke volume and, at high heart rates, may produce a decrease in cardiac output. Increased heart rate does not typically cause increased blood viscosity, a loss of action potential, or reduced cardiac contractility.
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