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Physiology

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Nerve Muscle Physiology

Question
22 out of 24
 

Which of the following are true about nerve action potential conduction?



A On activation there is influx of potassium and efflux of sodium

B It is decremental in nature

C It does not follow all or none law

D It requires a threshold stimulus to be activated

Ans. D It requires a threshold stimulus to be activated
  1. The action potential will not occur until the initial rise in the membrane potential is great enough to create the vicious cycle.
  2. This occurs when the number of sodium ions entering the fiber becomes greater than the number of potassium ions leaving the fiber A sudden rise of membrane potential by 15—30 mV is usually required.
  3. A sudden increase in the membrane potential in a large nerve fiber (from—70 mV to —55 mV) usually causes the explosive development of the action potential.
  4. This level of— 55 mV is known as threshold for stimulation. Q

Nerve Muscle Physiology Flashcard List

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