Which structure stores calcium ions needed for contraction inside a skeletal muscle fibre?
Correct answer: A. Sarcoplasmic reticulum
- A. Sarcoplasmic reticulum
- B. Sarcolemma
- C. T-tubule
- D. Mitochondrion
Explanation
The sarcoplasmic reticulum stores and releases calcium for skeletal muscle contraction. The sarcolemma is the muscle cell membrane, and T-tubules carry the action potential into the fibre.
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About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
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