Ch 12 part 1 Muscle Structural Proteins Quiz

Titin helps anchor the thick ______ filament to the Z-line at the end of the sarcomere.

Dystrophin attaches the myofibrils to the ______ at the end of the muscle cell.

The ______ is a web-like membranous organelle located adjacent to the T-tubules and surrounds each myofibril.

Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.

Titin is highly ______, and it helps give the muscle the ability to stretch and recoil.

The red appearance of skeletal muscle tissue is due to ______.

Rod-like, contractile organelles called ______ are located throughout the sarcoplasm.

Myofibrils are made up of three different classes of proteins: contractile proteins, ______ proteins, and structural proteins.

The thin filament is made of many ______ molecules that are strung together in a double helix.

The thick filament is made of about 300 individual ______ molecules.

The basic repeating unit of a myofibril is the ______.

The two major regulatory proteins found in the thin filaments of myofibrils of skeletal muscle are ______ and troponin.

______ is a regulatory protein complex that attaches to tropomyosin.

Binding of calcium to ______ causes a conformational change in the tropomyosin, exposing the myosin binding sites on the actin.

______ proteins hold everything together structurally.