A) longer than the length of a contracted sarcomere.
B) shorter than the length of a contracted sarcomere.
C) the same length as a contracted sarcomere.
D) the same length as the muscle fiber.
E) the same length as the myofibril.
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A) I band - contains only actin
B) M line - middle of the H zone
C) Z disk - structure between adjacent sarcomeres
D) myosin myofilaments - thin myofilaments
E) actin myofilaments - thin myofilaments
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A) threshold
B) depolarization
C) depolarization phase of action potential
D) repolarization phase of action potential
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A) cell membrane of a muscle fiber.
B) cytoplasm of muscle cells.
C) structural and functional unit of the skeletal muscle cell.
D) contractile thread that extends the length of the muscle fiber.
E) protein strand composed of actin.
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A) a protein found along the groove of the F-actin double helix
B) a T tubule and two adjacent terminal cisternae
C) the combination of myosin heads with active sites on actin molecules
D) the movement of myosin head while attached to actin myofilament
E) after exercise,the oxygen taken in that exceeds the oxygen required for resting metabolism
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A) looked the same as they did before the fall.
B) had undergone atrophy.
C) undergone hypertrophy.
D) seemed to have an increase in blood flow.
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A) Skeletal muscle is capable of spontaneous contraction.
B) Smooth muscle is found in the walls of hollow organs.
C) Cardiac muscle cells have multiple nuclei.
D) Smooth muscle cells are long and cylindrical.
E) There is a small amount of smooth muscle in the heart.
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A) When Na+ ion channels open,K+ ion channels close.
B) The sodium-potassium pump moves sodium into the cell.
C) Depolarization causes voltage-gated sodium ion channels to open.
D) Sodium ion channels are opened by high extracellular calcium levels.
E) The opening and closing of ligand-gated channels cause depolarization.
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A) skeletal muscle
B) smooth muscle
C) cardiac muscle
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A) 1,5,2,3,4
B) 1,3,4,2,5
C) 1,2,3,4,5
D) 1,3,2,5,4
E) 1,4,3,2,5
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A) a single muscle fiber
B) a single motor unit
C) a whole muscle
D) a single muscle fiber and a single motor unit
E) a single muscle fiber,a single motor unit,and a whole muscle
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A) the functioning of the sodium-chloride pump
B) negatively charged proteins do not readily diffuse across the plasma membrane
C) the attraction of chloride ions to other intracellular anions
D) the repulsion of potassium ions by the intracellular anions
E) the attraction of sodium ions to chloride ions
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A) shortens its length.
B) recoils to its original resting length.
C) stretches beyond its normal length.
D) responds to stimulation by the nervous system.
E) excites itself.
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A) threshold
B) depolarization
C) depolarization phase of action potential
D) repolarization phase of action potential
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Correct Answer
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A) a protein found along the groove of the F-actin double helix
B) a T tubule and two adjacent terminal cisternae
C) the combination of myosin heads with active sites on actin molecules
D) the movement of myosin head while attached to actin myofilament
E) after exercise,the oxygen taken in that exceeds the oxygen required for resting metabolism
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A) ATP
B) carbon dioxide
C) water
D) lactic acid
E) sodium
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A) skeletal muscle
B) smooth muscle
C) cardiac muscle
D) both skeletal and cardiac muscle
E) both cardiac and smooth muscle
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A) is a bundle of reticular fibers.
B) is surrounded by perimysium.
C) is only found in smooth muscle.
D) possesses an external lamina.
E) is a bundle of collagen fibers.
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A) can rapidly develop action potentials
B) shallow invaginations of cell membrane
C) relatively constant tension maintained for a period of time
D) intracellular cytoskeleton
E) enzyme that removes phosphate from myosin
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A) tetanus
B) tone
C) treppe
D) twitch
E) paralysis
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