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 best defines a sarcomere unit?
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The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere
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The portion of the myofibril between two successive ‘M’ lines is considered as the functional unit of contraction and is called a sarcomere
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The portion of the myofibril between two successive I-bands is considered as the functional unit of contraction and is called a sarcomere
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The portion of the myofibril between two successive A-bands is considered as the functional unit of contraction and is called a sarcomere
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Explanation:
Detailed explanation-1: -Thus, the correct answer is option A. i.e., Portion of myofibril between 2 successive Z-lines. Note: Sarcomere is the basic unit of contraction in the muscle fibre which is composed of two main proteins including actin and myosin and these structures are responsible for the contraction of muscle fibres.
Detailed explanation-2: -Thus, the correct answer is option (C), ‘Sarcomere’.
Detailed explanation-3: -The Z-band (Z-line, Z-disc) defines the boundary of the sarcomere in striated muscle and bisects the I-band of neighbouring sarcomeres (Fig. 1a) [1].
There is 1 question to complete.