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
Answer is A. Ans. (a) Cause opening of the calcium channel which leads to increase in Ca2+ contraction(Ref: Ganong, 25th ed/p.116)The never impulse which leads to initiation of smooth muscle contraction Cause opening of the calcium channel which leads to increase in Ca2+ contraction