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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Either A or B
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None of the above
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Detailed explanation-1: -The light bands are called I bands and contain only thin filaments. The dark bands are called A bands and contain thick and thin filaments, with the thick filaments running the entire length of the A band.
Detailed explanation-2: -The I band, A band, and H zone are regions in a sarcomere that constitute of actin (thin) and myosin (thick) filaments. I band is the region of actin filaments that are not superimposed by myosin filaments. The H zone is the region of myosin filaments that are not superimposed by actin filaments.
Detailed explanation-3: -Each I band has a dense line running vertically through the middle called a Z disc or Z line. The Z discs mark the border of units called sarcomeres, which are the functional units of skeletal muscle.