This figure shows a lateral view of the muscles of facial expression. What muscle does number 5 indicate?
A. Temporalis
B. Masseter
C. Buccinator
D. Sternocleidomastoid
E. Platysma
D
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What is the importance of reciprocal innervation in muscular reflexes?
A. It prevents excessive force on a muscle from resulting in tearing of fibers, or damage to the tendon. B. It ensures that limbs on the contralateral side of the body perform the same movements as those on the ipsilateral side. C. It recruits synergistic muscles to come to the aid of a muscle that help it generate force and limb motion. D. It prevents simultaneous activity of antagonistic muscle groups that would impede limb movement. E. It maintains signaling along afferent neurons from stretch receptors, even when a muscle shortens rapidly.
Which of the following is NOT a method of naming muscles?
A. By the action of the muscle B. By the shape of the muscle C. By the relative size of the muscle D. By the number of origins that the muscle has E. All of these are methods of naming muscles.
The rising phase of a muscle twitch represents ________
A) the time between stimulus and active muscle contraction B) the time of relaxation of the muscle fibers C) the time of shortening of the sarcomeres of the muscle fibers
What is NOT associated with a chemical synapse?
A) presynaptic neuron B) gap junction C) synaptic cleft D) neurotransmitter