PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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I band
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A band
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Z disc
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H zone
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Detailed explanation-1: -In a striated muscle, the myofibrils are arranged into alternate light and dark striations or bands. The dark bands are called A-bands or anisotropic bands and light bands are called I-bands or isotropic bands.
Detailed explanation-2: -The A band in skeletal muscle is also called as anisotropic band. The anisotropic band is made of both actin filaments and myosin filaments.
Detailed explanation-3: -The A-band appears black, comprising thick filaments that are partially overlapped with thin filaments. The thick and thin filaments overlap contain myosin to form dark bands called A bands.
Detailed explanation-4: -A.A-bands of the muscle is dark and contain myosin. B.I-bands are the light bands and contain actin.