PHYSIOLOGY
MICROSCOPIC MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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only actin filiments
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both actin and myosin filiments
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only myosin filiments
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whoops, need to re-watch that part
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Detailed explanation-1: -The I bands contain only thin (actin) filaments, whereas the A bands contain thick (myosin) filaments. The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only myosin.
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 anisotropic band contains both thick and thin filaments. Within the A-band is a paler region called the H-zone (from the German “heller", brighter). Named for their lighter appearance under a polarization microscope. H-band is the zone of the thick filaments that has no actin.