31) Ganglia represent
A) groups of axons.
B) groups of dendrites.
C) groups of neuron cell bodies.
D) groups of synapses.
32) Which of the following is the correct path an impulse takes across a synapse?
A) axon of postsynaptic neuron, dendrite of presynaptic neuron, synaptic cleft
B) dendrite of presynaptic neuron, synaptic cleft, axon of postsynaptic neuron
C) axon of presynaptic neuron, synaptic cleft, dendrite of postsynaptic neuron
D) synaptic cleft, dendrite of postsynaptic neuron, axon of presynaptic neuron
33) The majority of neurons in the body are
A) multipolar.
B) bipolar.
C) unipolar.
D) pseudounipolar.
34) Which cells are the macrophages of the CNS?
A) ependymal cells
B) microglial cells
C) satellite cells
D) Schwann cells
35) Of the following, which is the only structure that is in the PNS, as opposed to the CNS?
A) a tract
B) white matter
C) a ganglion
D) gray matter
36) Which of the following statements about an axon is
false?
A) It is also referred to as a nerve fiber.
B) It has branches.
C) It carries nerve impulses toward the cell body.
D) It has a uniform diameter.
37) Which of the following statements concerning sensory neurons is
incorrect?
A) Most are pseudounipolar.
B) Most have their cell bodies in ganglia outside the CNS.
C) They have peripheral and central processes.
D) They contain only dendrites.
38) Interneurons are found
A) only in the visceral nervous system.
B) only in the CNS.
C) only in the PNS.
D) only in the autonomic nervous system.
39) Most tumors in the brain originate from
A) glial cells.
B) multipolar neurons.
C) bipolar neurons.
D) unipolar neurons.
40) Which of the following statements about neurotransmitters is
false?
A) They alter the permeability of the postsynaptic cell membrane.
B) They are waves of positive charges that travel down axons.
C) They are released from synaptic vesicles.
D) They diffuse across the synaptic cleft.