The sarcolemma of muscle fibre folds inwards and forms a system of tubes which runs through the sarcoplasm called:
Correct answer: D. Transverse tubules
- A. Myofilaments
- B. Sarcoplasmic reticulum
- C. Z-lines
- D. Transverse tubules
Explanation
Transverse tubules: This option is the correct answer. The sarcolemma of a muscle fiber folds inwards at regular intervals to form invaginations called transverse tubules (T-tubules). T-tubules play a crucial role in transmitting electrical impulses (action potentials) deep into the muscle fiber, allowing for synchronous contraction of the sarcomeres.
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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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