A skeletal muscle
A) contracts spontaneously to maintain muscle tone
B) has to receive a stimulus from a motor neuron in order to contract
C) contracts automatically whether or not there is nerve stimulation
D) is capable of contracting automatically but contracts faster and more efficiently if there is a stimulus

Question

Quizplus · Accepted Answer

Skeletal muscles require a stimulus from a motor neuron in order to contract. This stimulus causes the release of calcium ions within the muscle fibers, which permits the interaction of actin and myosin molecules and results in muscle contraction. Spontaneous contraction or contraction in the absence of nerve stimulation is not a characteristic of skeletal muscles.

A Skeletal Muscle