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Practice Exam II

Practice Exam II - 1 Practice Exam II PNB 2250 2008 1...

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1 Practice Exam II, PNB 2250, 2008 1. Smooth muscle cells A) have a poorly developed sarcoplasmic reticulum B) are triggered to contract by a lowering of cytosolic Ca 2+ C) are multinucleate D) have a well-developed sarcoplasmic reticulum E) have clearly visible striations 2. Single-unit smooth muscle A) action potentials result from regenerative K + potentials B) cells contract independently of each other C) action potentials spread from cell to cell through gap junctions D) action potentials spread from cell to cell through varicosities 3. Which of the following methods of initiating action potentials is used by cardiac muscle? A) end-plate potentials B) pacemaker potentials C) somatic motor neurons D) summation of EPSPs 4. Cardiac muscle A) lacks T tubules B) has no gap junctions C) is striated D) has very few mitochondria E) contains only thick contractile fibers 5. What anchors actin and myosin filaments to the plasma membrane in smooth muscle cells?
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2 6. Smooth and skeletal muscle develop about the same amount of tension per unit cross- sectional area, but A) smooth muscle can maintain tension over a greater length B) smooth muscle has longer myosin filaments C) smooth muscle lacks troponin D) smooth muscle myosin ATPase activity is very slow E) all of the above 7. Which of the following is not expected to cause smooth muscle relaxation? 8. Smooth muscle can undergo spontaneous contraction due to pacemaker potentials. Spontaneous depolarization in these cells is caused by 9. A cardiovascular system is required by large multi-cellular organisms because A) for large multi-cellular animals, mass specific metabolic rates are very high B) for animals greater than 0.5 mm radius, diffusion is more than sufficient to transfer nutrients and remove wastes C) for animals greater than 0.5 mm radius, diffusion is insufficient to transfer nutrients and remove wastes D) large animals produce so much waste per unit weight that a cardiovascular system is needed
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