15.2 True/False Questions
1) Preganglionic fibers are myelinated, whereas postganglionic fibers are unmyelinated.
2) Parasympathetic stimulation of blood vessels causes vasoconstriction and increased blood pressure.
3) Fibers from the cranial and sacral regions of the spinal cord contribute to the sympathetic division.
4) Postganglionic sympathetic fibers are relatively long compared to those of the parasympathetic division.
5) The sympathetic and parasympathetic divisions can be distinguished by the amount of branching of the post-ganglionic fibers.
6) Postganglionic sympathetic fibers release norepinephrine and are called cholinergic fibers.
7) Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine.
8) All parasympathetic postganglionic fibers of the head travel through the trigeminal nerve (V) to their final destinations.
9) The cardiac center of the medulla oblongata regulates the diameter of blood vessels.
10) Vagal stimulation of the heart decreases heart rate, resulting in a drop in blood pressure.
11) Sympathetic trunk ganglia contain the cell bodies of sensory neurons and are located in the dorsal root of the spinal cord.
12) The main integration center of the ANS is the amygdala.
13) Because the fibers of the sympathetic division arise from the thoracic and lumbar regions of the spinal cord, they cannot innervate structures of the head or pelvis.
14) Parasympathetic stimulation of the pelvic organs cause defecation, voiding of urine, and erection.
15) Parasympathetic fibers innervate the sweat glands, arrector pili, and smooth muscles of the arteries.