Podcast
Questions and Answers
Titin helps anchor the thick ______ filament to the Z-line at the end of the sarcomere.
Titin helps anchor the thick ______ filament to the Z-line at the end of the sarcomere.
myosin
Dystrophin attaches the myofibrils to the ______ at the end of the muscle cell.
Dystrophin attaches the myofibrils to the ______ at the end of the muscle cell.
sarcolemma
The ______ is a web-like membranous organelle located adjacent to the T-tubules and surrounds each myofibril.
The ______ is a web-like membranous organelle located adjacent to the T-tubules and surrounds each myofibril.
sarcoplasmic reticulum
Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.
Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.
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Titin is highly ______, and it helps give the muscle the ability to stretch and recoil.
Titin is highly ______, and it helps give the muscle the ability to stretch and recoil.
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The red appearance of skeletal muscle tissue is due to ______.
The red appearance of skeletal muscle tissue is due to ______.
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Rod-like, contractile organelles called ______ are located throughout the sarcoplasm.
Rod-like, contractile organelles called ______ are located throughout the sarcoplasm.
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Myofibrils are made up of three different classes of proteins: contractile proteins, ______ proteins, and structural proteins.
Myofibrils are made up of three different classes of proteins: contractile proteins, ______ proteins, and structural proteins.
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The thin filament is made of many ______ molecules that are strung together in a double helix.
The thin filament is made of many ______ molecules that are strung together in a double helix.
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The thick filament is made of about 300 individual ______ molecules.
The thick filament is made of about 300 individual ______ molecules.
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The basic repeating unit of a myofibril is the ______.
The basic repeating unit of a myofibril is the ______.
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The two major regulatory proteins found in the thin filaments of myofibrils of skeletal muscle are ______ and troponin.
The two major regulatory proteins found in the thin filaments of myofibrils of skeletal muscle are ______ and troponin.
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______ is a regulatory protein complex that attaches to tropomyosin.
______ is a regulatory protein complex that attaches to tropomyosin.
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Binding of calcium to ______ causes a conformational change in the tropomyosin, exposing the myosin binding sites on the actin.
Binding of calcium to ______ causes a conformational change in the tropomyosin, exposing the myosin binding sites on the actin.
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______ proteins hold everything together structurally.
______ proteins hold everything together structurally.
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