HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sarcomere
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Sarcoplasm
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Sarcoplasmic reticulum
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Fascicles
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Detailed explanation-1: -The part between the two Z-lines is called as sarcomere. 5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Detailed explanation-2: -The portion of myofibril between two Z lines is known as a sarcomere.
Detailed explanation-3: -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-4: -A sarcomere is defined as the distance between the Z-lines. The Z-lines are pulled closer together during contraction and move further apart during relaxation. The Z-lines are closer during contraction because actin and myosin interaction generates cross-bridges, which slide the myofilaments over each other.