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What are the tunnel-like extensions of the sarcolemma into the muscle fiber?
transverse tubules transverse tubules
The impulse that triggers a contraction travels deep into a muscle fiber by means of what?
transverse tubules
What is name given to the regularly spaced infoldings of the sarcolemma?
transverse or T tubules
What connects the sarcolemma and the sarcoplasmic reticulum?
The T-tubules, or transverse tubules, connect the sarcolemma (muscle cell membrane) to the sarcoplasmic reticulum (membrane network within muscle cells). T-tubules allow for the rapid transmission of action potentials generated at the sarcolemma to the interior of the muscle cell, triggering the release of calcium from the sarcoplasmic reticulum to initiate muscle contraction.
Irregular transverse thickenings of the sarcolemma?
Irregular transverse thickenings of the sarcolemma connect cardiac muscle fibers to neighboring muscle fibers. The gap junctions that occur with irregular transverse thickening of the sarcolemma allow the myocardium to contract as a single unit.
What is the function of the tubules?
See this link for nice details...http://people.eku.edu/ritchisong/301notes3.htm In muscle contraction the transverse tubules transmit the muscle impulse into the inner cell.
The command to contract is distributed throughout a muscle fiber by the?
Transverse Tubules
What are the muscle action potential penetrates into a fiber along the?
Transverse tubules (T-Tubules)
What is the function of the transverse tubules in muscle cells?
The transverse tubules in muscle cells help transmit electrical impulses deep into the cell, allowing for coordinated muscle contractions.
What is the function of transverse tubules in muscle cells?
Transverse tubules in muscle cells help transmit electrical impulses deep into the cell, allowing for coordinated muscle contractions.
What is the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
Excitation begins as a motor neuron transmits an action potential to the neuromuscular junction where it gets propagated along the muscle cell. This action potential is an electrical impulse that depolarizes the muscle cell membrane, the sarcolemma, which then releases ions in the sacroplasmic reticulum and transverse tubules. When this happens calcium is released into the sarcomeres that contain actin and myosin myofilaments. The calcium unlocks the binding sites and creates crossbridges with the globular heads on the mysoin fibers. With ATP as the energy source, this crossbridging brings the Z-lines closed together and the muscle fiber contracts.
What do action potentials travel down to cause muscle contraction?
Axon of neuron, sarcolemma, and T-tubules.
