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Nearly 95% of the ATP demands of a resting cell are provided by __________ metabolism.

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Which of the following indicates serious muscle damage?


A) High blood levels of creatine kinase
B) Conversion of ADP to ATP
C) High blood levels of creatine phosphate
D) High blood levels of lactic acid
E) Low blood pH

F) A) and E)
G) A) and B)

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Kicking a ball or lifting an object is an example of which of the following?


A) Eccentric contraction
B) Concentric contraction
C) Isometric contraction
D) Isotonic contraction
E) Treppe

F) A) and B)
G) A) and C)

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In the sliding filament model, which of the following occurs?


A) Thin filaments move away from the center of the sarcomere.
B) Cross-bridges do not generate tension on thin filaments.
C) Thin filaments slide past thick filaments.
D) Actin and myosin filaments do not overlap.
E) Cross-bridges are portions of titin molecules.

F) A) and B)
G) B) and C)

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Which of the following does not occur during muscle contraction?


A) Calcium concentration in the sarcomere increases.
B) Hemoglobin concentration in muscle fibers increases.
C) Myosin heads bind to actin.
D) Acetylcholine is broken down.
E) The H bands disappear.

F) C) and D)
G) A) and E)

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In the digestive tract, pacesetter cells are also called __________ cells.

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