What is the role of calcium in muscle contraction? a. Its binding to a regulatory protein causes the protein to move, exposing actin binding sites to the myosin heads. b. It provides energy for contraction. c. It blocks contraction when the muscle relaxes. d. It forms the heads of the myosin molecules in the thick filaments inside a muscle fiber.
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Step 1: Calcium binds to the troponin C subunit in the actin filament. Show more…
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What is the role of calcium in muscle contraction? a. Its binding to a regulatory protein causes the protein to move, exposing actin binding sites to the myosin heads. b. It provides energy for contraction. c. It blocks contraction when the muscle relaxes. d. It forms the heads of the myosin molecules in the thick filaments inside a muscle fiber. Muscle A and muscle B have the same number of fibers, but muscle A is capable of more precise control than muscle B.
In a skeletal muscle fiber, Ca2+ ATPase pump a) ends the contraction and causes muscle relaxation B) helps release of calcium from sarcoplasmic reticulum c) causes the contraction d) acts by passive transportation of calcium
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The function of the T tubules in muscle contraction is to (a) make and store glycogen, (b) release $\mathrm{Ca}^{2+}$ into the cell interior and then pick it up again, (c) transmit the action potential deep into the muscle cells, (d) form proteins.
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