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Question:

Which of the following is correct about the given figure?

Length of both anisotropic and isotropic band has changed.

The length of the thick and thin myofilaments has changed.

Length of the sarcomere remains same.

The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

Solution:

Myosin cross bridges are the globular head of a myosin molecule. It projects from a myosin filament in muscle and in the sliding filament hypothesis of muscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments.