Question

The important muscle proteins that help in movement are

• A. Actin and myosin
• B. Tropomyosin
• C. Troponin
• D. All of these

Answer 1

Answer: (D)

All of these

Actin and myosin are the structural filaments that play the main role in muscle contraction by sliding filament theory.

Troponin and tropomyosin are the regulatory proteins that regulate the rate of attachment of myosin heads to actin. Hence they also play an important role in muscle contraction and its movement.

Troponin regulate availability of active sites of actin by attaching with Ca++

So the correct option is D.