Question

In a skeletal muscle, T-tubules

• A. Secrete acetylcholine
• B. Give mechanical support
• C. Conduct impulse forward
• D. Release calcium flow for muscle contraction

Answer 1

The correct option is D Release calcium flow for muscle contraction

The t-tubule or transverse tubule is actually a deep invagination of the plasma membrane of skeletal muscle cells. These are found next to the terminal cisternae of the sarcoplasmic reticulum (SR) and stores calcium ions. The calcium channels in t-tubules get activated when stimulated and allows the release and flow of calcium into the cells for muscle contraction.

Thus, the correct answer is option D.