EasyNEET TEST
+4 / -1
Which of the following proteins plays a direct role in muscle contraction?
A
Troponin
B
Insulin
C
Myoglobin
D
Trypsin
Explanation
Troponin is a key regulatory protein located on the thin (actin) filaments. It works alongside tropomyosin to control the interaction between actin and myosin; when calcium binds to it, it changes shape to initiate the contraction process. Other options like insulin and trypsin are hormones or digestive enzymes and do not have a structural or functional role in the contraction of muscle fibers.
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