It length of myofibril from one Z-line to the next:
Correct answer: B. Sarcomere
- A. Plasma membrane
- B. Sarcomere
- C. Sarcoplasm
- D. Sarcolemma
Explanation
The length of myofibril from one Z-line to the next is known as sarcomere 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 generate cross-bridges, which slide the myofilaments over each other.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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