Fundamentholfundamenthol
NEET2022Biology
Q.

Select the incorrect statement regarding synapses :

  1. A

    The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.

  2. B

    Electrical current can flow directly from one neuron into the other across the electrical synapse.

  3. C

    Chemical synapses use neurotransmitters

  4. D

    Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

Solution

At chemical synapses, transmission is delayed by the time needed to release neurotransmitter from the presynaptic terminal, diffuse across the synaptic cleft, and bind to postsynaptic receptors (synaptic delay).

Electrical synapses lack this delay; current passes through gap junctions directly. So impulse transmission across electrical synapses is faster, not slower, than at chemical synapses. Statement (4) is therefore incorrect.

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