48) Which of the following is the correct sequence of events for muscle contract

Question

48) Which of the following is the correct sequence of events for muscle contractions? A) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke B) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR sliding of myofilaments C) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments D) neurotransmitter release, motor neuron action potential, muscle cell action potential release of calcium ons from SR, ATP-driven power stroke 49) During contraction of heart muscle cells, A) calcium is prevented from entering cardiac fibers that have been stimulated B) the action potential is prevented from spreading from cell to cell by gap junctions C) the action potential is initiated by voltage-gated slow calcium channels D) some calcium enters the cell from the extracellular space but the sarcoplasmic reticulum releases larger amounts of calcium from intracellular stores 50) Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions? A) visceral smooth muscle B) cardiac muscle C) skeletal muscle D) multiunit smooth muscle 51) Which of the following is not a usual result of resistance exercise? A) increase in the number of myofibrils within the muscle cells B) increase in the number of muscle cells C) increase in the efficiency of the respiratory system D) increase in the efficiency of the circulatory system 52) Which of the following statements is true? A) Cardiac muscle cells are found in the heart and large blood vessels. B) Smooth muscle cells have T tubules. C) Striated muscle cells are long and cylindrical with D) Cardiac muscle cells have many nuclei. 53) The sliding filament model of contraction involves A) the shortening of thick filaments so that thin filaments slide past B) the Z discs sliding over the myofilaments C) actin and myosin shortening but not sliding past each er D) actin and myosin sliding past each other and partially overlapping

Explanation / Answer

48. C. Motor neuron action potential, neurotransmitrer release,muscle cell action potential, release of calcium ions from SR, ATP driven power stroke, sliding of myofilaments.

49. D. Some calcium enters the cell from extracellular space but Sarcoplasmic reticulum release large amount of calcium from intracellular stores.

50. D. Multiunit smooth muscle.

51. B. Increase in number of muscle cells.

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