than is he stimulus is D. None of the above. 21. During an action potential, ion

Question

than is he stimulus is D. None of the above. 21. During an action potential, ion permeability is determined by D. All of the above. 22. The interval of time during which an action potential cannot be generated no matter how strong the subsequent stimulus is, is called: A. The relative refractory period. B. The absolute refractory period. D. Repolarization. 23. Myelin is required for: A. Action potential propagation. B. Ca influx. C. Ca2+-based action potentials. D. Saltatory conduction. 24. The resting membrane potential for neurons is because of all of the following, except: A. K leak channels that open when the neuron is stimulated. B. The Na"-K-ATPase pump. C. Protein anions. D. Ca2 effmux. 25. A neuronal membrane is a: A. Pure resistor. B. Pure capacitor. C. Both a resistor and a capacitor. D. Neither a resistor nor a capacitor.

Explanation / Answer

And 20:- B. All or none law states that when threshold potential is applied all the fibres are stimulated and they reach the maximum amplitude.

And 21. D.

Ans 22. B the absolute refractive period is that time when no action potential is generated no matter how strong the stimulus is applied.

Ans 23. D myline are required for saltatory conduction as the signal jump from one node of ranvier to the another node of ranvier where myline sheath is absent.

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