Question

question 15
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which of the following is the primary protein that makes up the thick filaments of sarcomeres within the muscle cell?
actin
tropomyosin
troponin
myosin

Explanation:

Sarcomeres are the basic contractile units of muscle fibers. Thick filaments in sarcomeres are mainly composed of myosin. Actin forms thin filaments. Tropomyosin and troponin are regulatory proteins associated with thin filaments (actin).

Answer:

Myosin