Which of the following proteins has an impact on the regulation of internal movements?
A
Actin
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B
Myosin
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C
Tropomyosin
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D
All of the above
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Solution
The correct option is A All of the above Actin is the thin filament which is present in the muscles. Myosin is the thicker filaments in the muscles. The tropomyosin is the regulatory protein which is present in the grooves of the actin filament. This is the regulatory protein which helps in the contraction and relaxation of the myosin bridge. These proteins are the structural units of the muscle fibres and help in the contraction and relaxation of muscles to allow internal movement of the involuntary muscles.