Multiple choice

Unidirectional transmission of nerve impulse is ensured by the structures called __________.

  1. synapse

  2. nodes of ranvier

  3. sodium pump

  4. nephron

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A Correct answer
Explanation

Synapses ensure unidirectional transmission because neurotransmitters are released only from the presynaptic neuron and bind only to postsynaptic receptors. This chemical one-way mechanism prevents backward signal flow. Nodes of Ranvier speed conduction, sodium pumps maintain resting potential, and nephrons are kidney structures.

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