Question

Which of organelle regulates the muscle contraction during internal movements?

• A. Ribosomes
• B. Golgi bodies
• C. Sarcoplasmic reticulum
• D. Both A and B

Answer 1

The correct option is C Sarcoplasmic reticulum

• Sarcoplasmic reticulum is similar to endoplasmic reticulum present in other cells. It is present in sarcoplasm (cytoplasm of the muscle cell) of the muscle fiber (muscle cell).
• The main function of the Sarcoplasmic reticulum is to store calcium ions (Ca2+).
• When nerve signal reaches the neuromuscular junction it triggers the release of calcium from sarcoplasmic reticulum which in turn facilitates muscle contraction by binding to troponin.
  
• Hence the organelle regulates the muscle contraction during internal movements is sarcoplasmic reticulum.
• So, the correct answer is'Sarcoplasmic reticulum'.