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in Biology by (46.2k points)

Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse

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  • Electrical impulse travels through a neuron. 
  • But to be transmitted to another neuron, it need to be passed in the form of neurotransmitters. Neurotransmitters are specialized chemicals. 
  • They can enter a neuron only through specialized channels.
  •  Such channels are present in dendrites but not in axon.
  •  On the other hand, a neurotransmitter can enter a dendrite. 
  • Due to this, the flow of signals in a synapse is from axonal end of one neuron to dendritic end of another neuron but not the reverse.

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