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Physiology

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Nerve Muscle Physiology

Question
8 out of 24
 

Synaptic conduction is mostly orthodromic because: (LQ)



A Dendrites cannot be depolarized

B Once repolarized, an area cannot be depolarized

C The strength of antidromic impulse is less

D Chemical mediator is located only in the presynaptic terminal

Ans. D Chemical mediator is located only in the presynaptic terminal
  1. An axon can conduct the impulse in either direction.
  2. When an action potential is initiated in the middle of an axon, 2 impulses traveling in opposite directions are set up by electronic depolarization on either side of the initial current sink. In living animals, impulses normally pass in one direction only Q (from synaptic junctions or receptors along axons to their termination).
  3. Such conduction is called orthodromic. Conduction in the opposite direction is called antidromic. Q Since synapses, unlike axons, permit conduction in 1 direction only, any antidromic impulse that they set up fail to pass the first synapse they encounter and die out at that point.

Nerve Muscle Physiology Flashcard List

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