PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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hold muscle cells together.
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are found in the sarcolemma.
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contain myosin and actin myofilaments.
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extend from the sarcolemma to the T-tubule.
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Detailed explanation-1: -Most of the cytoplasm consists of myofibrils, which are cylindrical bundles of two types of filaments: thick filaments of myosin (about 15 nm in diameter) and thin filaments of actin (about 7 nm in diameter).
Detailed explanation-2: -Answer and Explanation: The muscle types containing actin and myosin are (d) skeletal, smooth, and cardiac muscle. Actin and myosin, also known as the thin and thick filaments respectively, are essential for contraction of muscles. These filaments bind together to form crossbridges that enable contraction.
Detailed explanation-3: -There are Six actin filaments surround each myosin filament, and each actin filament is surrounded by three myosin filaments. This arrangement gives the muscles a striated appearance under magnification.
Detailed explanation-4: -Actin and myosin are both proteins that are found in every type of muscle tissue. Thick myosin filaments and thin actin filaments work together to generate muscle contractions and movement.
Detailed explanation-5: -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.