Card Set Information
Bundles of contractile and elastic proteins responsible for muscle contractions.
a collection of muscle cells that make up the skeletal muscle
Forms thick filaments of the myofibril that convert chemical bond energy ATP into motion. (protein with actin contracts and relaxes muscle fibers)
A protein in a muscle fiber that, together with myosin, is responsible for contraction and relaxation.
The contractile unit of a myofibril.
Elastic giant protein that maintains spatial structure of myofibrils. (attaches myosin filaments to z lines)
A protein that blocks muscle contraction until calcium ions are present.
Protein that functions with tropomyosin to block muscle contraction until calcium ions are present.
Modified endoplasmic reticulum in muscle that concentrates and stores Ca++.
Invaginations of the muscle fiber membrane, associated with the sarcoplasmic reticulum.
Enlarged portions of the sarcoplasmic reticulum near the actin and myosin filaments of a muscle fiber.
An aggregation of myosin in muscle.
An actin containing filament of the myofibril.
Also known as Transverse tubules
Addition of motor units to increase the force of contraction in a muscle.