MUSCLE NERVE CARTILAGE BONE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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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: -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-3: -A. Sarcomere. Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses.
Detailed explanation-4: -The sarcomere is the fundamental unit of contraction and is defined as the region between two Z-lines. Each sarcomere consists of a central A-band (thick filaments) and two halves of the I-band (thin filaments). The I-band from two adjacent sarcomeres meets at the Z-line.
Detailed explanation-5: -Thus, the correct answer is option (C), ‘Sarcomere’.