Physiology 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 💡 Explanation Which of the following happens when a nerve impulse arrives at the neuromuscular junction? ✓ Correct Answer: B. ACh binds to receptors in Sarcolemmal membrane