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Acetylcholine crosses a tiny gap between nerve and muscle. That gap is the synaptic:

ACrust
BCrate
CCleft
DCrest
Answer & Solution
Correct answer: C. Cleft
1. The two membranes do not touch. 2. A narrow space lies between them. 3. That space is the synaptic cleft. _Source: OpenStax Anatomy and Physiology 2e, Chapter 10, Muscle Tissue._
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