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Question
The functional unit of myofibril is made up of
The functional unit of myofibril is made up of
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Solution
The correct option is A Complete A-band and two half I-band
Myofibrils of skeletal muscles contain dark and light bands. The dark band is called Anisotropic or A-band and the light band is called Isotropic or I-band. The I-band is cut in the middle by a dark Z-line. The portion between two successive Z-lines is called sarcomere. Sarcomere is the functional unit of myofibrils. Hence, sarcomere contains one complete A-band and two half I-bands.So, the correct answer is D.
Myofibrils of skeletal muscles contain dark and light bands. The dark band is called Anisotropic or A-band and the light band is called Isotropic or I-band. The I-band is cut in the middle by a dark Z-line. The portion between two successive Z-lines is called sarcomere. Sarcomere is the functional unit of myofibrils. Hence, sarcomere contains one complete A-band and two half I-bands.
So, the correct answer is D.
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