PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following describes the sarcomere?
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The basic unit of muscle’s cross-striated myofibril
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. A protein band which defines the boundary between one sarcomere
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Various muscle proteins
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Contains the protein, actin
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Explanation:
Detailed explanation-1: -A sarcomere is the basic contractile unit of a myocyte (muscle fibre). A sarcomere is composed of two main protein filaments (thin actin and thick myosin filaments) which are the active structures responsible for muscular contraction.
Detailed explanation-2: -The answer is (a) The contractile unit between two Z discs. Sarcomeres are the contractile units of both cardiac and skeletal muscle fibres.
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