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MDCAT Biology QUESTION #4177
Question 1
In muscle fibers, T-tubules are extension of the sarcolemma that penetrate into the cell's interior. What is their main function during muscle contraction?
  • Unblock actin's binding sites
  • Conduct nerve impulses deep into the muscle cell✔️
  • Synthesize glycogen in the sarcoplasm
  • Store calcium ions with in the sarcoplasmic reticulum
Correct Answer Explanation
T-tubules conduct action potentials deep into muscle fibers to trigger calcium release.