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Muscle Physiology: Contraction Mechanisms · Zoology

In skeletal muscle, what is the specific role of the T-tubules (transverse tubules)?

  1. Storage of glycogen reserves for anaerobic energy metabolism
  2. Synthesis of contractile proteins such as actin and myosin
  3. Conducting action potentials deep into the muscle fiber interior
  4. Anchoring the muscle fiber mechanically to the surrounding tendon
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Correct answer: Conducting action potentials deep into the muscle fiber interior

T-tubules are invaginations of the sarcolemma that reach deep into the cell. They ensure that an electrical impulse reaches all the myofibrils nearly simultaneously, triggering uniform calcium release from the sarcoplasmic reticulum.

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