Muscles: Topic 2

Any of the thread-like bundles of filaments in muscle cells

Muscle Cell

Protein that, with actin, causes muscle contraction

Protein in a muscle fiber that forms the thin filaments that slide between filaments of the protein myosin, shortening muscle fibers

Structural and functional unit of a myofibril

Enlarged portion of the sarcoplasmic reticulum near the actin and myosin filaments of a muscle fiber

Protein that blocks muscle contraction until calcium ions are present

Protein that functions with tropomyosin to block muscle contraction until calcium ions are present

Membranous network of channels and tubules in muscle fiber, corresponding to ER of other cells

Membranous channel that extends deep into cell from a muscle fiber membrane