<prompt> The nerve impulse which leads to initiation of smooth muscle contractionCause opening of the calcium channel which leads to increase in Ca2 contractionCause both plasma membrane and T - tubules to undergo depolarisationInhibits Na entry in sarcomereIs initiated by binding of acetylcholine to receptors in sarcoplasmic reticulum  <response>: Ans. a Cause opening of the calcium channel which leads to increase in Ca2 contractionRef: Ganong, 25th edp.116The never impulse which leads to initiation of smooth muscle contraction Cause opening of the calcium channel which leads to increase in Ca2 contraction 