During a cross-bridge cycle in skeletal muscle, the
a. cross bridge is energized as myosin ATPase activity hydrolyzes ATP.
b. myosin cross bridge is able to bind with an actin molecule when Ca2+ pulls the troponin-tropomyosin complex aside.
c. linkage between actin and the myosin cross bridge is broken at the end of the cross-bridge cycle as Mg2+ binds to the cross bridge.
d. both (a) and (b) above.
e. all of these answers.
D
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