Exam 8: A--Muscle Physiology

Atrophy can develop in a muscle by either denervation or disuse.

During aerobic exercise, the primary means for ATP production in muscle fibers involves

The larger the motor units within a muscle, the more precisely controlled the gradations of contraction.

If the load on a muscle is increased, eventually a load will be reached at which the velocity of shortening becomes zero. At this point, the muscle contraction is referred to as

The regulation of smooth muscle contraction is mediated by the phosphorylation of ____ in response to calcium binding to ____.

A skeletal muscle undergoes hypertrophy mainly by producing many more muscle fibers.

The lever system at the elbow joint provides a mechanical advantage so that when the biceps muscle contracts to flex the elbow joint and lift an object in the hand, the force developed in the biceps can be considerably less than the actual load that is moved.

Both multi-unit and single-unit smooth muscle are under motor control from the autonomic nervous system.

The muscle cells of a marathon runner's legs would exhibit all these characteristics except

Which statement is incorrect about cross bridges?

The striated appearance of skeletal muscle is due to the

Complete each of the following statments. For a(n) ____________________ isotonic contraction, the contraction resists the stretching of the muscle.

Complete each of the following statments. The functional unit of skeletal muscle is a(n) ____________________, and these units attach end-to-end to form a(n) ____________________.

Multi-unit smooth muscle is

The contraction phase of a muscle cell lasts longer than the refractory period.

Complete each of the following statments. The three types of muscle tissue are ____________________, ____________________, and ____________________.

Conscious initiation of muscle contraction is controlled by

Spastic paralysis occurs when

Slow-oxidative muscle fibers have high resistance to fatigue.

The H zone