Concept: This question tests your understanding of the fundamental differences in the speed of impulse transmission between electrical and chemical synapses.

Why (A) is correct: In an electrical synapse, the pre- and post-synaptic membranes are in very close proximity, and their cytoplasms are connected by gap junctions. This allows for direct flow of ions from one neuron to the next, resulting in almost instantaneous and therefore faster transmission of the nerve impulse. There is no synaptic delay associated with neurotransmitter release and binding.

Why other options are wrong:

• (B) slower: Chemical synapses are slower due to the time required for neurotransmitter release, diffusion across the synaptic cleft, and binding to receptors.
• (C) first faster then slower: Impulse transmission speed is a characteristic property of the synapse type, not a variable process within a single synapse.
• (D) first slower then faster: This option is incorrect for the same reason as (C).

Common Mistake: Students sometimes confuse the prevalence of chemical synapses with their speed. While chemical synapses are more common, electrical synapses are faster.

NEET Tip: Remember that electrical synapses are like a direct wire connection, while chemical synapses involve a 'message in a bottle' (neurotransmitter) that needs to travel across a gap.

Correct Answer: (A)