In a Relaxed Skeletal Muscle, Actin is Not Chemically Bound

Question

In a relaxed skeletal muscle, actin is not chemically bound to
A) myosin.
B) troponin.
C) tropomyosin.
D) Z lines

Accepted Answer

In a relaxed skeletal muscle, actin is not chemically bound to myosin. The interaction between actin and myosin occurs during muscle contraction when myosin's heads bind to actin filaments. Troponin and tropomyosin work together to regulate this interaction by blocking or allowing myosin to bind with actin. Z lines are structures that anchor actin filaments and help maintain the muscle's overall structure.