<prompt> Which of the following happens when a nerve impulse arrives at the neuromuscular junction?Release of calcium from Sarcoplasmic reticulumACh binds to receptors in Sarcolemmal membraneRelease of K into the SarcoplasmSodium ions rush outside the Sarcoplasm  <response>: 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 