QUESTION 14 What is the primary role of Ca2+ during skeletal muscle contraction? A. It binds to troponin to reveal myosin binding sites B. It binds to myosin to cause the ratcheting motion of the heads C. It forms a cross-bridge between F-actin filaments and myosin D. It depolarizes the membrane of presynaptic neurons in motor end plates
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The function of Ca2+ in skeletal muscle contraction is to a. cause an allosteric change in myosin so that it detaches from actin. b. provide the energy necessary for the movement of the cross-bridge. c. expose the myosin-binding sites on the thin filaments. d. stimulate an action potential in the muscle fiber. e. do a and c only.
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.
3. The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.ore) calciumrole) to learn more about the role of calcium. (a) What are "T-tubules" and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
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