Question

question 13
1 pts
damage to the ____ nerve could make the diaphragm unable to function.
o phrenic
o axillary
o radial
o medial cutaneous
question 14
1 pts
nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the ____ plexus.
o sacral
o cervical
o coccygeal
o lumbar
question 15
1 pts
which of the following is a description of the principle of autonomic antagonism as it relates to the autonomic nervous system?
o if sympathetic impulses tend to inhibit the effector, parasympathetic impulses tend to stimulate it.
o if sympathetic impulses inhibit autonomic centers, parasympathetic impulses tend to stimulate them.
o if sympathetic impulses tend to stimulate an effector, parasympathetic impulses tend to inhibit it.
o if sympathetic impulses initiate nerve conduction, parasympathetic impulses stop nerve conduction.

Explanation:

• Question 13: The phrenic nerve innervates the diaphragm. Damage to it would paralyze the diaphragm, making it unable to function. The axillary nerve is related to the shoulder, the radial nerve to the posterior arm and forearm, and the medial cutaneous nerve to the skin of the arm.
• Question 14: The sacral plexus gives rise to nerves that innervate the pelvic floor and surrounding areas. The cervical plexus is in the neck, the coccygeal plexus is very small and near the coccyx, and the lumbar plexus is more related to the anterior and lateral thigh.
• Question 15: Autonomic antagonism means that the sympathetic and parasympathetic systems have opposite effects on effectors. If sympathetic impulses stimulate an effector, parasympathetic impulses tend to inhibit it (and vice - versa).

Answer:

Question 13: phrenic
Question 14: sacral
Question 15: If sympathetic impulses tend to stimulate an effector, parasympathetic impulses tend to inhibit it.