PHYSIOLOGY
MICROSCOPIC MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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only myosin filiments
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only actin filiments
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both myosin and actin filiments
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i need to go watch the video again
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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 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. Thus the length of the thick filament determines the length of the A band.
Detailed explanation-3: -The A-band is made up of myosin filaments whereas the I-band is made up of actin filaments alone. A-Bands are the anisotropic bands of the sarcomere. I-Bands are the isotropic bands of sarcomere.