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Exam 4 part - Exam question and answers Anatomy And Physiology II (York Technical College) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Exam 4 part - Exam question and answers Anatomy And Physiology II (York Technical College) Scan to open on Studocu Studocu is not sponsored or endorsed by any college or university Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

Chap 12 & 13 Study online at https://quizlet.com/_5grghn 1. A neuron that transmits a nerve impulse toward the CNS is called a -motor neuron -bipolar neuron -interneuron -sensory neuron sensory neuron 2. The anterior horn of the spinal cord contains -interneurons -somatic motor neurons -predominantly myelinated neurons -autonomic motor nuclei somatic motor neurons 3. The myelin sheath is formed by -Schwann cells -nodes of ranvier -nissl bodies -neuron cell bodies Schwann cells 4. If a stimulus causes impulse conduction (potentials) through all parts of a neuron,, the correct pathway for that conduction is: -axon, cell body, and dendrite. -receptor, axon, and cell body. -dendrite, axon, cell body, and receptor. -dendrite, cell body, and axon dendrite, cell body, and axon 5. Multipolar neurons have: -multiple axons and multiple dendrites. -multiple axons and one dendrite. -multiple dendrites and one axon. -one dendrite and one axon multiple dendrites and one axon. 6. The white matter of the nervous system is made up of mostly: -nuclei. -ganglia. -myelinated fibers. - unmyelinated fibers myelinated fibers. 1 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

Chap 12 & 13 Study online at https://quizlet.com/_5grghn 7. Which is true of a neuron at resting potential? -The highest concentration of K+ is extracellular. -There is no movement of Na+ ions. -The Na+/K+ pump has moved Na+ into the extracel- lular space and K+ into the intracellular space. -The outer surface of the plasma membrane has a negative charge. The Na+/K+ pump has moved Na+ into the extracellu- lar space and K+ into the intracellu- lar space. 8. The first event to occur when threshold is reached is: -the sodium channels are inactivated - sodium channels open. -the membrane hyperpolarizes. - the potassium channels open sodium channels open. 9. Which neuroglial cell removes cellular debris in the CNS? -ependymal cells -oligodendrocytes -astrocytes -microglial cells microglial cells 10. A synapse consists of: - the plasma membrane of a postsynaptic neuron. -a synaptic knob -a synaptic knob, a synaptic cleft and a post-synaptic neuron -a synaptic cleft. a synaptic knob, a synaptic cleft and a post-synap- tic neuron 11. When an impulse reaches a synapse: -neurotransmitters are released from the presynaptic neuron. -a neurotransmitter will be released from the postsy- naptic neuron. - the two nerve fibers come in direct contact. -an electrical charge will jump the gap. neurotransmitters are released from the presynaptic neuron. 12. Excitatory neurotransmitters are most likely to: -initiate an action potential. -increase the speed of impulse conduction. initiate an action potential. 2 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

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Chap 12 & 13 Study online at https://quizlet.com/_5grghn -make the cell membrane impermeable to Na+. make the resting potential more negative. 13. When current jumps across an insulating myelin sheath from node to node, the type of impulse con- duction is called: -repolarization. -saltatory. -refraction -diffusion. saltatory. 14. For a neurotransmitter to produce an inhibitory post- synaptic potential, which of the following must occur in the postsynaptic neuron? -no change in membrane polarity -a depolarization -a hyperpolarization a hyperpolariza- tion 15. Which of the following is true of spatial summation? -Simultaneous stimulation of more than one postsy- naptic neuron occurs. - Impulses are fired in a rapid succession by the same neuron. -Speed of impulse transmission is increased when several neurotransmitters are released. -Neurotransmitters released simultaneously from sev- eral presynaptic knobs converge on one postsynaptic neuron. Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron. 16. Which neurotransmitter can cause depression? - Serotonin -Dopamine -Acetylcholine -Glutamate Serotonin 17. Neurotransmitters are released in a synapse and bind to: -receptors on the postsynaptic neuron. -the nucleus of the postsynaptic neuron. receptors on the postsynaptic neu- ron. 3 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

Chap 12 & 13 Study online at https://quizlet.com/_5grghn -the synaptic cleft. -receptors on the presynaptic terminals. 18. Dendrites conduct impulses: -into the synaptic cleft. - away from that neuron's axon -toward cell bodies. -away from cell bodies. toward cell bodies. 19. Nerves that contain mostly afferent fibers are called: -Schwann nerves. -mixed nerves. -motor nerves. -sensory nerves. sensory nerves. 20. At a resting membrane potential, compared with the outside of the neuron, the inside has a ____ charge. -positive. -negative. -equal negative. 21. Schwann cells have a similar function in the peripher- al nervous system as these cells have in the central nervous system. -Oligodendrocytes -Astrocytes -Microglia -Ependymal cells Oligodendrocytes 22. Which of the following is NOT a factor in the velocity of nerve impulse conduction? -Amount of myelination -Diameter -Temperature -Number of dendrites Number of den- drites 23. A cluster of cell bodies (soma) found in the central nervous system are called -fibers. -nerves. nuclei. 4 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

Chap 12 & 13 Study online at https://quizlet.com/_5grghn -nuclei. ganglia. 24. ___ helps to maintain the proper chemical environ- ment for neurons in the CNS. -Schwann cells -Microglia -Oligodendrocytes -Astrocytes Astrocytes 25. The myelin sheath is formed by -organelles in the axon. -connective tissue fibers. -macromolecules in the CSF. -cells. cells. 26. In order for a peripheral nerve fiber to regenerate it must have -at least the entire axon and neurilemma intact. -all dendrites intact. -the soma and at least some neurilemma intact -at least part of the soma intact. the soma and at least some neurilemma intact 27. Opening of sodium gates in a neuron typically leads to -hyperpolarization of the plasma membrane. -plasma membrane voltage returning to the resting membrane potential. -depolarization of the plasma membrane. -repolarization of the plasma membrane. depolarization of the plasma mem- brane. 28. While the plasma membrane of a neuron is repolariz- ing its -calcium gates are open. - potassium gates are open. - sodium gates are open. -chloride gates are open. potassium gates are open. 29. Inhibitory postsynaptic potentials (IPSPs) are associ- ated with 5 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

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Chap 12 & 13 Study online at https://quizlet.com/_5grghn -no change of the cell membrane potential -repolarization of the cell membrane. -depolarization of the cell membrane. -hyperpolarization of the cell membrane. hyperpolarization of the cell membrane. 30. The innermost layer of the meninges is the: - pia mater. -dura mater. - arachnoid membrane. pia mater. 31. The main divisions of the central nervous system are the: -the brain only - brain and spinal cord. -brain, spinal cord, and peripheral nerves. -brain, spinal cord, and autonomic nerves. brain and spinal cord. 32. Which of the following is not a plexus of the spinal nerves? -Thoracic - Lumbar -Cervical -Brachial Thoracic 33. Which is NOT a part of a reflex arc? - sensory receptor -effector - a ganglia -interneuron a ganglia 34. An area of skin that provides sensory information to the CNS via a pair of spinal nerves is a -reflex. -graded potential. - dermatome. plexus. dermatome. 35. The lateral horns of gray matter are found where in the spinal cord? - lumbar region only thoracic and upper lumbar regions 6 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

Chap 12 & 13 Study online at https://quizlet.com/_5grghn -cervical region only -thoracic and upper lumbar regions -thoracic region only 36. know how to label spinal cord 37. If a sensory neuron enters and the motor neuron of a reflex arc leaves the same side of the spinal cord, that pathway is said to be - reflexive -contralateral -lagging -ipsilateral ipsilateral 38. know how to label a neuron 39. know how to label an action potential 7 / 7 Downloaded by Keishon Hardin (keishon89grace@gmail.com) lOMoARcPSD|37727514

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