What Is the Function of the Transverse Tubules in a Skeletal-Muscle

question 99

Multiple Choice

What is the function of the transverse tubules in a skeletal-muscle fiber?

• A) They store the calcium ions that are the main source of activation for the cross-bridge cycle.
• B) They form the Z lines that mark the end of each sarcomere.
• C) They allow action potentials to propagate deep into the center of skeletal muscle cells.
• D) They manufacture and store ATP.
• E) They run in parallel with the myofibrils, and have abundant Ca²⁺-ATPase proteins for pumping Ca²⁺ back into the sarcoplasmic reticulum.

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