Most distinguishing feature between skeletal muscle and smooth muscle
Troponin
Tropomyosin
Myosin
Actin
Troponin is the calcium binding protein in the Skeletal muscle. In smooth muscle, calmodulin is the calcium binding protein. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 40,59)
General physiology