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Physiology

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Nerve Muscle Physiology

Question
13 out of 24
 

In a motor nerve fiber, lower threshold potential is seen in: (LQ)



A Axon hillock
B Body
C Axon
D Dendrite

Ans. A Axon hillock
  1. One might expect that depolarization at one point on the plasma membrane would generate an action potent irrespective of inhibitory signals elsewhere However, this is avoided in many neurons by the axon hillock the region where the axon emerges from the cell body.
  2. The portion of the plasma membrane at the axon hillock has:

i. No synapses of its own and

ii. A lower threshold than elsewhere on the cell

  1. The action potential is usually generated in the axon hillock Q.
  2. Having neither excitatory nor inhibitory synapses of its own, it is able to evaluate the total picture of EPSPs and IPSPs created in the dendrites and cell body.

Nerve Muscle Physiology Flashcard List

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