Physiology The nerve impulse which leads to initiation of smooth muscle contraction A Cause opening of the calcium channel which leads to increase in Ca+2 contraction B Cause both plasma membrane and T - tubules to undergo depolarisation C Inhibits Na+ entry in sarcomere D Is initiated by binding of acetylcholine to receptors in sarcoplasmic reticulum 💡 Explanation The nerve impulse which leads to initiation of smooth muscle contraction ✓ Correct Answer: A. Cause opening of the calcium channel which leads to increase in Ca+2 contraction