PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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All of these listed are myofibril proteins
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Troponin is not a myofibril protein.
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Trypsin is not a myofibril protein.
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Titin is not a myofibril protein.
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Detailed explanation-1: -Which of the Proteins listed below IS NOT a myofibril protein? Trypsin is not a myofibril protein.
Detailed explanation-2: -Myofibrils constitute the contractile system, which consists of four complex proteins: myosin, actin, tropomyosin, and troponin. These four proteins are arranged into a functional unit called a sarcomere (see Fig.
Detailed explanation-3: -The myofibrillar protein components most important for muscle fiber structure are actin and myosin. They are the most abundant proteins in muscle and are directly involved in the ability of muscle to contract and to relax.
Detailed explanation-4: -The thick filaments are made up of myosin while the thin filament is made up of three proteins actin, troponin, and tropomyosin. So, the correct answer is ‘Myosin’.
Detailed explanation-5: -The MS analysis of 1D gel zones has established the presence of isoforms of myosin heavy chain, myosin light chain, actin, troponin and tropomyosin.