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.

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

The sarcolemma of a muscle fiber is the Blank______.Multiple choice question.plasma membranecytoplasmrough endoplasmic reticulumsmooth endoplasmic reticulum

Several of the structures in the muscle cell are given special names. For example, the cytoplasm of a muscle fiber is called the sarcoplasm. Which of the following is truly a unique structure to muscle cells (not just a renamed one)?Multiple Choicecytoplasmnucleusendoplasmic reticulumtransverse (T) systemplasma membrane

Calcium ions released from the sarcoplasmic reticulum enter the ______________.Multiple ChoicenucleussarcoplasmT tubulessarcolemma