Question

describe how action potentials travel from the sarcolemma into the interior of a muscle fiber, resulting in the release of calcium ions into the sarcoplasm. action potentials travel along t tubules. action potentials travel along the surface of the sarcoplasmic reticulum. action potentials travel along the surface of myofibrils. need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill. all rights reserved. privacy center terms of use

Explanation:

Action potentials in muscle fibers travel from the sarcolemma to the interior via T - tubules. T - tubules are invaginations of the sarcolemma that penetrate deep into the muscle fiber, allowing the action potential to reach the sarcoplasmic reticulum, which then releases calcium ions into the sarcoplasm. The other options are incorrect as action potentials do not travel along the surface of the sarcoplasmic reticulum or myofibrils in this context.

Answer:

Action potentials travel along T tubules.