Question

55. Choose the false statement:

A. When somatic motor nerve fibers innervate skeletal muscle tissues, each nerve cell extends the full distance from the CNS to the effector without synapsing along the way.

B. During exercise, blood flow can be adjusted to match the demands of different skeletal muscles; here sympathetic fibers will increase blood flow (vasodilate) in the most active muscles, and parasympathetic fibers reduce flow (vasoconstrict) in less active muscles.

C. During periods of stress, the adrenal medulla will release epinephrine (adrenaline) in response to being stimulated by preganglionic sympathetic fibers innervating this gland.

Answer 1

Option 1

The somatic motor neuron has typical 2 neuron pathway having upper motor neuron and lower motor neuron. The upper motor neuron is from brain to spinal cord and the lower motor neuron is from spinal cord to muscle.

So single nerve cell in the statement is wrong

During exercise, the sympathetic nervous system will increase the blood flow to skeletal muscle and parasympathetic nervous system with decrease it.

The sympathetic preganglionic fibers directly innervate the adrenal gland and cause the release of epinephrine.

Hope this helps... Thank you!!!