Question

The diagram given represents the histology of a striped muscle. Label the parts A, B, C, D E and F.

• A. A- Sarcoplasm, B- Nucleus, C- Sarcolemma, D- Myofibril, E- Dark band, F- Light band
• B. A- Sarcoplasm, B- Light band, C- Myofibril, D- Sarcolemma, E- Nucleus, F- Dark band
• C. A- Light band, B- Sarcoplasm, C- Myofibril, D- Sarcolemma, E- Nucleus, F- Dark band
• D. A- Sarcolemma, B- Nucleus, C- Dark band, D- Light band, E- Sarcoplasm, F- Myofibril

Answer 1

The correct option is C A- Light band, B- Sarcoplasm, C- Myofibril, D- Sarcolemma, E- Nucleus, F- Dark band

A is the light band. It is composed of actin filaments. It is also called I band. During contraction of muscles, the actin filaments slide over the myosin filaments that is responsible for the shortening of the I band.

B is the cytoplasm of the muscle cell also called as sarcoplasm.

C is the myofibril. These are proteins responsible for muscle contraction and striated appearance.

D is the plasm a membrane of the muscle cell also called as sarcolemma.

E is the nucleus that is the control center of the muscle cell.

F is the dark band also called A band. It consists of myosin filament and runs along the length of the muscle fiber.

Thus the correct answer is option C.