The energy for muscle contraction is supplied by the enzymatic hydrolysis of ATP by ATPase present in:
Heavy meromyosin
Light meromyosin
Tropomyosin
Troponin
The energy for muscle contraction is supplied by the enzymatic hydrolysis of ATP by ATPase present in heavy meromyosin. Two strands of heavy meromyosin are found in each myosin head - one of which is folded over as a protein mass. Light meromyosin is also found in myosin but is not involved in splitting ATP. Troponin and tropomyosin are located on the actin filament. Ref: Murray R.K. (2011). Chapter 49. Muscle & the Cytoskeleton. In D.A. Bender, K.M. Botham, P.A. Weil, P.J. Kennelly, R.K. Murray, V.W. Rodwell (Eds), Harper's Illustrated Biochemistry, 29e.