PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the sarcomeres get longer
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the sarcomeres increase in length
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both are true
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both are false
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Detailed explanation-1: -So, the correct answer is ‘Decrease in length of actin myofilaments’.
Detailed explanation-2: -Summary. According to the sliding filament theory, a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber. When all the sarcomeres in a muscle fiber shorten, the fiber contracts.
Detailed explanation-3: -So, the correct answer is ‘A-Band remains constant’.
Detailed explanation-4: -Striated muscle fibers: actin and myosin filaments that power contraction are organized into repeating arrays, called sarcomeres, that have a striated microscopic appearance. [1] Cardiac muscle tissue-is under involuntary control by the body’s autonomic nervous system (ANS).