The transverse tubular system: A)speeds the transmission of an action potential down the length of a fiber. B)activates only one myofibril at a time. C)allows the deeper myofibrils to receive the effects of action potentials quickly. D)enables the rapid transport of lactic acid away from the muscle. E)allows for individual sarcomeres to contract independently Of the other. 2. In a healthy young individual, high intensity running is associated with a decrease in left ventricular end-systolic volume and an increase in stroke volume. What is the probable mechanism for this response? A) A decrease in catecholamine release. B)An increase in parasympathetic tone to the ventricle. C) A decrease in systemic resistance. D) An increase in sympathetic input to the ventricle. E) A decrease in venous return of blood to the heart.
1. The transverse tubular system:
A)speeds the transmission of an action potential down the length of a fiber.
B)activates only one myofibril at a time.
C)allows the deeper myofibrils to receive the effects of action potentials quickly.
D)enables the rapid transport of lactic acid away from the muscle.
E)allows for individual sarcomeres to contract independently Of the other.
2. In a healthy young individual, high intensity running is associated with a
decrease in left ventricular end-systolic volume and an increase in stroke
volume. What is the probable mechanism for this response?
A) A decrease in catecholamine release.
B)An increase in parasympathetic tone to the ventricle.
C) A decrease in systemic resistance.
D) An increase in sympathetic input to the ventricle.
E) A decrease in venous return of blood to the heart.
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