Choose the best answer.

1			The Nissl bodies of a neuron consist of
			A)	synaptic vesicles.
			B)	lipofuscin.
			C)	rough endoplasmic reticulum.
			D)	cytoskeleton.
2			A unipolar neuron has
			A)	one axon arising from the soma.
			B)	one axon and one dendrite arising from the soma.
			C)	two axons and multiple dendrites arising from the soma.
			D)	a single process that branches into a peripheral fiber and a central fiber.
3			The main component of myelin is
			A)	phospholipid.
			B)	protein.
			C)	lipofuscin.
			D)	cholesterol.
4			One role of astrocytes is to
			A)	produce cerebrospinal fluid.
			B)	phagocytize tissue debris.
			C)	promote neuron growth.
			D)	form myelin in the CNS.
5			The bodies of Schwann cells make up
			A)	the axolemma.
			B)	the myelin.
			C)	the endoneurium.
			D)	the neurilemma.
6			The reason that damaged nerve fibers in the CNS are not able to regenerate is that they lack
			A)	the axolemma and neurilemma.
			B)	the neurilemma and endoneurium.
			C)	the myelin sheath and neurilemma.
			D)	Schwann cells and nodes of Ranvier.
7			What autoimmune disorder results in deterioration of the myelin sheath in the CNS?
			A)	Tay-Sachs disease
			B)	spina bifida
			C)	multiple sclerosis
			D)	Parkinson's disease
8			Most brain tumors arise from
			A)	neuroglial cells.
			B)	sensory (afferent) neurons.
			C)	multipolar neurons.
			D)	bipolar neurons.
9			The embryonic forebrain, midbrain, and hindbrain arise from what structure?
			A)	the neural crest
			B)	the neural tube
			C)	the telencephalon
			D)	the neural folds
10			Which of the following is not a characteristic of neurons?
			A)	excitability
			B)	conductivity
			C)	ability to undergo mitosis in adults
			D)	secretion
11			Nissl bodies are located in the synaptic knobs of a neuron.
			A)	True
			B)	False
12			In a converging neuronal circuit, input from one neuron leads to output from multiple neurons.
			A)	True
			B)	False
13			Because of reverberating circuits, one motor neuron in the brain can ultimately cause thousands of muscle fibers to contract.
			A)	True
			B)	False
14			Blood capillaries of the brain are enveloped by astrocytes.
			A)	True
			B)	False
15			Neurofibrin is an end product of lysosomal digestion of organelles and accumulates in "wear and tear" granules.
			A)	True
			B)	False
16			Multiple sclerosis is a genetically inherited condition that results from the lack of a lysosomal enzyme that normally decomposes a type of glycolipid.
			A)	True
			B)	False
17			An action potential is the result of the diffusion of ions across the plasma membrane.
			A)	True
			B)	False
18			Which of the following is not a neurotransmitter?
			A)	acetylcholine
			B)	serotonin
			C)	glutamate
			D)	lipofuscin
19			Astrocytes convert glucose to lactate and contribute to the nourishment of neurons.
			A)	True
			B)	False
20			Ependymal cells increase in number during an infection of the CNS.
			A)	True
			B)	False
21			Phagocytic cells in the CNS that fight infection are astrocytes.
			A)	True
			B)	False
22			Neurons that have one axon and numerous dendrites are structurally classified as bipolar.
			A)	True
			B)	False
23			Somatic motor neurons carry information from the CNS to skeletal muscle fibers.
			A)	True
			B)	False
24			Gamma-aminobutyric acid (GABA) is a major excitatory neurotransmitter.
			A)	True
			B)	False
25			Schwann cells surround the neuron cell bodies in the ganglia of the PNS.
			A)	True
			B)	False
26			Neurons that are most responsible for the integrative functions of the nervous system are the sensory neurons.
			A)	True
			B)	False