What are the transverse (T) tubules?Multiple choice question.They are modified segments of smooth endoplasmic reticulum which store calcium needed for contraction.They are tube-like invaginations of the sarcolemma that extend inward throughout the muscle cell.They are the main component of the cytoskeleton of the cell.They are composed of the actin and myosin myofilaments.

Which statement most accurately describes the role of T tubules in skeletal muscle cells?A.T tubules bind acetylcholine at the neuromuscular junction to generate a depolarizing stimulus.B.Depolarizing current reaches the sarcoplasmic reticulum by traveling down T tubules.C.Muscle contraction is driven by the sliding of T tubules across one another in the sarcomere.D.T tubules sequester Ca2+ out of the cytosol to prevent prolonged muscle contraction.

What is a muscle fiber structure formed from the sarcolemma that penetrates into the cells?Multiple choice question.SarcolemmaMyofibrilsSacroplasmic reticulumT (transverse) tubules

What produces the striations of a skeletal muscle cell? the sarcoplasmic reticulum the arrangement of myofilaments a difference in the thickness of the sarcolemma Thick filaments the T tubules

Deep inward extensions of the sarcolemma form a tunnel-like network inside the muscle cell known as ___________.Group of answer choicestransverse tubulessarcoplasmic reticulummyofilamentsmyofibrils

In a skeletal muscle fiber, the sarcolemma forms tubules that penetrate into the cell and contact the sarcoplasmic reticulum.