13. Influx of ______ ions causes an IPSP, while influx of ______ causes an EPSP. a. chloride; sodium b. potassium; chloride c. potassium; sodium d. sodium; chloride e. None of the above

13. Influx of ions causes an IPSP, while influx of causes an EPSP. a. chloride; sodium b. potassium; chloride c. potassium; sodium d. sodium; chloride e. None of the above

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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7. How do absolute and relative refractory periods contribute to the unidirectionality of an action potential? What would happen if a stimulating electrode placed halfway down an axon artificially depolarized a cell above threshold? Would an action potential be stimulated and what direction would it travel, to axon terminal, cell body, or both? Explain
During depolarization potassium ions (K*) flow into the neuron. potassium ions (K*) flow out of the neuron. sodium ions (Na*) flow into the neuron. sodium ions (Na*) flow out of the neuron. 23. а. b. C. d. During repolarization potassium ions (K*) flow into the neuron. potassium ions (K*) flow out of the neuron. sodium ions (Na*) flow into the neuron. sodium ions (Na*) flow out of the neuron. 24. a. b. с. d. During the refractory period sodium ions (Na*) are pumped out of the 'neuron. potassium ions (K*) are pumped into the neuron. proteins are pumped out of the neuron. Both “a" and “b" are correct. 25. а. b. c. d.
1. It is not important to know the actual numbers for absolute or relative refractory periods. Due to refractory periods, is there a maximum frequency of APs?
9. Sodium Channels activate prior to Potassium channels. a. What would happen to the action potential if the potassium channels opened prior to sodium channels? b. Draw and describe what an action potential would look like; Label all axes.
3.single choice Which part of the nervous reflex is fatigable. A. synapse B. sensory receptors C. afferent neuron D. efferent neuron E. effector 4.multiple choice The factors that influence the AP conduction velocity on nerve fiber include A. thickness of the myelin shealth. B. myelinated or not C. diameter of the fiber D. temperature E. strength of the stimulation 5.single choice Which property could be destroyed by the local anesthetics procaine (普鲁卡因). A. physiological integrity B. structure integrity C. insulation D. infatigable 6.single choice Which of the following is not the chemical mediated signal transmission. A. gap junction B. neuro-muscular junction. C. hormone binding with the receptor on the target. D. classical synapse E. varicosity 7.single choice In the nerve reflex, the latency from the stimulation to the response is mainly dependent on A. the number of synapses in the central nervous system. B. the action potential…
Under what conditions could the opening of a chloride channel actually depolarize a neuron rather than hyperpolarize it? i. The neuron is resting at -75 mVii. The extracellular chloride concentration is lower than the intracellular chloride concentrationiii. The neuron is close to its threshold of -55 mVa. i onlyb. iii onlyc. i and ii onlyd. ii and iii onlye. i, ii, and iiif. None of these
25) During the refractory Period sodium ions (Na*) are pumped out of the neuron. potassium ions (K*) are pumped into the neuron. proteins are pumped out of the neuron' Both a and "b" are correct'
5) The division of the nervous system responsible for the preparation of the body in case of emergency(i.e. fight or flight) is thea. central nervous sYstem.b. parasympathetic nervous system. c. sympathetic nervous sYstem.d. none of the above. 6) Neurons that carry impulses toward effector organs and muscles are calleda. motor neurons.b. afferent neurons.c. sensory neurons. d. both a and b.
22. Blocking the opening of the voltage-gated potassium channels (after depolarization to threshold has occurred) would cause which of the following changes to the Action Potential? a. The neuron would never depolarize b. The neuron could never reach threshold c. The neuron would depolarize but never repolarize d. Blocking the potassium channels would decrease the intracellular [potassium].
9. In an inhibitory synapse, neurotransmitter binding to a receptor cause opening of __________ resulting in a hyperpolarizing event and reduces likelihood of AP generation. a. sodium ion channels b. potassium ion channels c. chloride ion channels d. a and b e. b and c
Under what conditions could the opening of a chloride channel actually depolarize a neuron rather than hyperpolarize it? i. The neuron is resting at -75 mV ii. The extracellular chloride concentration is lower than the intracellular chloride concentration iii. The neuron is close to its threshold of -55 mV O a. i only O b. ii only O c. i and ii only O d. ii and iii only O e. i, ii, and i O f. None of these
8. Use diagram 136 to answer the next question. If the axon of the neuron X is stimulated at threshold level Fig 136 Dendrite Axon Neuron Neuron Neuron 个 Symapse Synapse メ a. Neuron W will also be stimulated b. Neurons W and Y will both be stimulated c. Acetylcholine will move across synapse 2 d. Acetylcholine will move across synapse 1 and 2