Which of the following happens when a nerve impulse arrives at the neuromuscular junction?: (A) Release of calcium from Sarcoplasmic reticulum, (B) ACh binds to receptors in Sarcolemmal membrane, (C) Release of K+ into the Sarcoplasm, (D) Sodium ions rush outside the Sarcoplasm
Answer is B. Molecules of ACh diffuse across the synaptic cleft and bind to ACh receptors on the motor end plate. Ref: Human Anatomy And Phsyiology, edited by Sanghani, Page 204