The size of a synaptic cleft (the gap separating nerve cells) in electrical synapse is
Correct answer: A. 0.2 nm
- A. 0.2 nm
- B. 2 nm
- C. 20 nm
- D. 200 nm
Explanation
Option A is correct. The size of a synaptic cleft in an electrical synapse is typically 0.2 nm, which is much smaller compared to the synaptic cleft of chemical synapses, which ranges from 20 to 40 nm. This small size is crucial because it allows ions and small molecules to pass quickly between the two cells through gap junctions, facilitating rapid electrical signal transmission. Conversely, Option B (2 nm) and Option C (20 nm) are incorrect as they exceed the actual size of the cleft in electrical synapses, which would hinder the speed of signal transmission. Option D (200 nm) is also incorrect, being significantly larger than the typical size, and does not represent the characteristics of electrical synapses.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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