Muscle Anatomy and Physiology Quiz

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Questions and Answers

What protein makes up the thick filaments in muscle fibers?

Myosin (correct)
Troponin
Tropomyosin
Actin

What is the function of tropomyosin in muscle contraction?

To bind and hydrolyze ATP
To inhibit the interaction of actin and myosin by covering the myosin-binding site on actin
To block the myosin-binding sites on actin at rest (correct)
To attach the troponin complex to tropomyosin

What is the role of troponin C in muscle contraction?

Binds calcium ions to initiate contraction (correct)
Inhibits the interaction of actin and myosin by covering the myosin-binding site on actin
Attaches the troponin complex to tropomyosin
Binds and hydrolyzes ATP

What is the structure of the myosin molecule?

<p>Two pairs of light chains and one pair of heavy chains coiled around each other to form the "tail", with two globular "heads" containing actin-binding and ATP-binding sites (A)</p> Signup and view all the answers