Protein-specific for smooth muscle contraction is: (A) Troponin, (B) Tropomyosin, (C) Myosin, (D) Calmodulin
Answer is D. Calmodulin is the calcium binding protein in the smooth muscle. It is similar to troponin C of Skeletal muscle.(REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 59)