Why is it necessary to have an action potential (electrical signal) in the muscle for contraction? a. Actin and myosin must be electrically charged to create a cross-bridge. b. The SR will only release Ca2+ if it has been electrically stimulated. c. Sarcomeres require a negative electrical charge to start sliding. d. ATP cannot be split into ADP and Pi without an action potential.

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Q: What is the role of ATP in muscle function? a. ATP provides energy that enables myosin to form cross…

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Q: Predict what might happen to a muscle cell that is extensible but not elastic. What if the reverse…

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Q: The sliding filament mechanism describes the process during which: a. actin and myosin slide…

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Q: The Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d.…

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Q: Calcium plays a crucial role in the contraction of skeletal muscles. i. Where is calcium stored…

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Q: This player in smooth muscle contraction is analogous to troponin in skeletal and cardiac muscle…

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Q: Which of the following statements about the Ca2+ release channels in the sarcoplasmic reticulum is…

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Q: What role (function) does calcium have within a muscle fiber? a. trigger muscle potentials along…

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Q: What is the first and most direct energy source for muscle con￾traction? a. glucose b. ATP c.…

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Q: The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so…

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Q: Which of the following is true?   A. Muscle fibers either will contract with all the force…

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Q: What type of motor neuron stimulates skeletal muscle fibers to contract by the…

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Q: On a microscopic scale, explain how muscle fibers move in order to make a muscle shorter? Explain…

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Q: Put the following in order to accurately follow the sequence of events associated with muscle fiber…

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Q: Where is ATP's energy used during crossbridge cycling? A. When ATP attaches to myosin and causes…

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Q: How is the list below to be properly put in order to describe a muscular contraction?

A: Muscle contraction can be defined as the activation of tension-generating sites that are present…

Q: Which statement about the diagram is not correct??  A. The diagram enlarged one myofibril B. This…

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Q: What causes relaxation in a skeletal muscle fiber Select one: a. Myosin remains attached to actin b.…

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Q: What happens when myosin filaments hydrolyze ATP molecules in muscles?    a. Actin–myosin complexes…

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Q: which of the following statement is true?  a. Fast fibers have difficulty fatiguing  b. Fast…

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Q: An ion that is essential for muscle contraction is Ca2+.  Which of the following statements about…

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