Q. The important contractile proteins in a muscle are:

A
Actin and Myosin
B
Actin and Tropomyosin
C
Myosin and Tropomyosin
D
Myosin and Troponin
Solution:

Muscles are composed of two major protein filaments: a thick filament composed of the protein myosin and a thin filament composed of the protein actin.

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