41) Which cells provide the myelin sheath for neurons in the CNS?
A) Schwann cells
B) astrocytes
C) microglial cells
D) oligodendrocyctes
42) Which of the following is the correct arrangement of a reflex arc?
A) receptor, sensory neuron, integration center, motor neuron, effector
B) integration center, receptor, sensory neuron, motor neuron, effector
C) effector, sensory neuron, integration center, motor neuron, receptor
D) receptor, motor neuron, integration center, effector, sensory neuron
43) Which relatively rare type of neuron has two processes extending from opposite sides of the cell body?
A) bipolar
B) multipolar
C) pseudounipolar
D) unipolar
44) The complexity of the CNS can be attributed to
A) the large number of sensory neurons carrying information to the CNS.
B) the different types of receptors outside the CNS.
C) the large number of interneurons in the CNS.
D) the large number of motor neurons leaving the CNS.
45) White matter represents
A) aggregations of neuron cell bodies in the brain.
B) aggregations of neuron cell bodies in the spinal cord.
C) myelinated axons traveling together in the CNS.
D) dendrites traveling together in the ANS.
46) These glial cells surround the cell bodies of sensory neurons within ganglia of the PNS.
A) astrocytes
B) microglia
C) satellite cells
D) Schwann cells
47) These glial cells arise from embryonic white blood cells.
A) ependymal cells
B) microglia
C) oligodendrocytes
D) satellite cells
48) Action potentials travel along the
A) axon membrane.
B) dendrite membrane.
C) cell body.
D) myelin.
49) The peripheral nerve fibers that measure the degree of stretch in the biceps brachii muscle and its tendons are classified as
A) general somatic sensory.
B) general somatic motor.
C) special visceral sensory.
D) general visceral motor.
50) All of the following are characteristics of dendrites
except
that they
A) are more extensive branching than axons.
B) always conduct action potentials.
C) conduct signals toward the cell body.
D) typically occur as more than one per cell.