Select the incorrect statement regarding synapses :
(1) Impulse transmission across a chemical synap

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Question

Select the incorrect statement regarding synapses :
(1) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.
(2) The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.
(3) Electrical current can flow directly from one neuron into the other across the electrical synapse.
(4) Chemical synapses use neurotransmitters

Accepted Answer

Correct Answer: A - Impulse transmission across a chemical synapse is always faster than that across an electrical synapseExplanation: Statement A is incorrect. Electrical synapses are actually faster than chemical synapses. In electrical synapses, ions flow directly between neurons through gap junctions (connexon channels), with virtually no synaptic delay. Chemical synapses involve neurotransmitter release, diffusion across the synaptic cleft, and receptor binding - all of which introduce a synaptic delay (~0.5 ms).Why other statements are correct:- B: In electrical synapses, the pre- and postsynaptic membranes are separated by only 2-4 nm and connected by gap junctions (correct)- C: Ions (electrical current) flow directly from one neuron to the next through connexon channels in gap junctions at electrical synapses (correct)- D: Chemical synapses release neurotransmitters (e.g., acetylcholine, dopamine) into the synaptic cleft (correct)Key Concept: Electrical synapse: gap junctions, bidirectional, fast, no delay; Chemical synapse: neurotransmitters, usually unidirectional, slower due to synaptic delay (~0.5 ms). Electrical synapses are important where rapid, synchronous activity is needed (e.g., cardiac muscle, some CNS regions).

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