1 A) are found in the PNS B) produce a myelin sheath around axons C) are roughly one-tenth the size of neurons D) are neuroglia E) All selections are correct. 2 A) are all or none events B) occur when depolarization reaches a threshold potential C) do not add or interfere with one another D) are propagated along axons with a decrease in amplitude E) All of the selections are correct. 3 A) accumulation of acetylcholine in the synaptic cleft B) accumulation of acetylcholinesterase in the synaptic clef C) muscle relaxation D) repeated action potentials E) None of the selections is correct. 4 A) the cerebellum B) the cerebrum C) the whole brain D) the mesencephalon. E) the optic tracts 5 A) the presence of modified receptors B) nothing, because it doesn't act on pacemaker cells C) G protein-coupled receptors D) an influx of Na+ ions into the cell E) an influx of K+ ions into the cell. 6 A) occur in the central nervous system B) occur in the peripheral nervous system C) link afferent and efferent neurons D) occur in the central nervous system and link afferent and efferent neurons E) There are no true comments. 7 A) a resting potential B) an action potential C) a charge difference across the cell membrane, with a positive charge inside the cell and a negative one outside D) a neutral state E) a resting potential and a charge difference across the cell membrane, with a positive charge inside the cell and a negative one outside 8 A) They are chemical signals. B) Neurotransmitters are broken down slowly after they are released. C) They occur in gap junctions. D) They are released by the postsynaptic cell. E) All statement are true. 9 A) The continue to grow throughout their lives B) Fish brains have a prominent hind brain. C) Fish had three characteristic brain divisions over 500 million years. D) No selections are true. E) All selections are true. 10 A) It has two divisions: the sympathetic and the asympathetic. B) It has two divisions: the somatic and the autonomic. C) It functions only to receive information from the environment. D) It functions only to carry responses to effectors (e.g. muscle cells). E) It utilizes interneurons to integrate efferent and afferent signals. 11 A) synaptic cleft B) axon C) myelin sheath D) neurotransmitter E) dendrites 12 A) somatic nervous system B) central nervous system C) parasympathetic nervous system D) sympathetic nervous system E) All answers are correct. 13 A) more dendritic spines B) more myelin sheath material C) a larger cell body D) a longer axon E) more nodes of Ranvier 14 A) sensory neurons B) motor neurons C) oligodendrocytes D) Schwann cells E) None of the answers is correct. 15 A) The inside and the outside of the neuron membrane have the same electrical charge. B) The outside of the neuron membrane is more negatively charged than the inside. C) The inside of the neuron membrane is more negatively charged than the outside. D) All of the answers are correct because of variations among individual neurons. E) The sodium/potassium pump begins to operate only after a neuron fires. 16 A) true B) false 17 A) dendrite(s) B) cell body C) axon D) the entire neuron 18 A) serotonin derived from glycine B) epinephrine derived from tryptophan C) acetylcholine derived from cysteine D) epinephrine derived from tyrosine 19 A) Eyelid blinks are reflexes, and they are so fast they happen before the brain realizes what happened. B) The cutaneous spinal reflex is faster than the knee jerk reflex. C) The knee jerk reflex involves a monosynaptic synapse. D) Interneurons in reflexes are found in the gray matter. E) Reflexes are involuntary movements. 20 A) dorsal, ventral, lateral and medial B) parietal, frontal, dorsal, occipital C) motor, sensory, associative and integrative D) frontal, parietal, temporal and occipital 21 A) It is a part of the ventricular system. B) It divides the frontal lobe from the parietal lobe. C) It connects the right and left cerebral hemispheres. D) It is an extension of the brain stem. 22 A) true B) false
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