Which of the following is the name of the modified endoplasmic reticulum found in muscle cells?
Correct answer: D. Sarcoplasmic reticulum
- A. T-tubule
- B. Sarcomere
- C. Myoplasmic reticulum
- D. Sarcoplasmic reticulum
Explanation
The sarcoplasmic reticulum (SR) is a membrane-bound structure found within muscle cells that is similar to the smooth endoplasmic reticulum in other cells. The main function of the SR is to store calcium ions (Ca2+).
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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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