What Is the Function of the Transverse Tubules in a Skeletal

question 92

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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