Contractile Unit Of A Muscle

Question

The contractile unit of musculus fibers is:

Musculus fiber

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Sarcomere

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Myofibril

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Sarcosome

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Solution

The correct option is B

Sarcomere

The correct option is choice B.

Caption for correct option:

1. The unit of muscle contraction is called a sarcomere.
2. It is formed of $\frac{1}{\mathrm{ii}}$I-ring + i full A-band + another $\frac{1}{2}$I-band.
3. I bands are formed of actin filaments and A bands are formed of myosin filaments.
4. During muscle contraction, the actin filaments from both ends slide between the thick myosin filaments.
5. The sarcomere as well as the whole muscle filament shortens in size.

Explanation for incorrect options:

Option A:

1. A muscle prison cell is an unbranched and cylindrical fiber.
2. It is 10-100$\mu m$thick and x-40mm long.
3. It is covered by a sparse plasma membrane called sarcolemma.

Pick C:

1. Information technology is about 1-3$\mu m$in diameter.
2. It is a combination of actin and myosin filaments.
3. Calorie-free bands are composed of actin and nighttime bands are composed of myosin.
4. The low-cal and dark bands are arranged alternatively throughout the length o the myofibril.

Option D:

1. It is a big specialized mitochondrion.
2. Information technology is found in striated muscle cobweb.

Terminal answer: The contractile unit of muscle fibers is the sarcomere.

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Contractile Unit Of A Muscle,

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