NPB101-Usrey-Debello-MII

NPB101-Usrey-Debello-MII - NPB 101— Exam 2 Winter 2003...

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Unformatted text preview: NPB 101— Exam 2 Winter 2003 Multiple Choice identth the letter of the choice that best completes the statement or answers the question. 1. During a cross-bridge cycle in skeletal muscle, the a. 1; c. cross bridge is energized as myosin ATPase activity hydrolyzes ATP. myosin cross bridge is able to bind with an actin molecule when Ca2+ pulls the troponin-tropomyosin complex aside. linkage between actin and the myosin cross bridge is broken at the end of the cross~bridge cycle as Mg2+ binds to the cross bridge. Both (a) and (b) above. All of these answers. 2. Which of the following statements concerning the characteristics of different types of muscle fibers is incorrect? at ® him the higher the ATPase activity. the faster the speed of contraction. muscles that have high glycolytic capacity and large glycogen stores are more resistant to fatigue. muscles with high ATP-synthesizing ability are more resistant to fatigue. oxidative types of muscle fibers contain myoglobin. muscle fibers containing large amounts of myoglobin have a dark red color in comparison to the paler fibers, which have little myoglobin. 3. Which of the following isnot involved in the relaxation of skeletal muscle? a. -.b_ *6.) ad. fit 4. During muscle contractio a. )7. E. .d. a. when acetylcholine is destroyed by acetylcholinesterase. when there is no longer a local action potential. 4, . I... when the T tubules actively take up the Ca2+ that had been released.“ ' W '5‘“ when the actin and myosin molecules are no longer bound together. when the tr0ponin-tropomyosin complex slips back into its blocking position. creme->1 W‘fiems contract. A band becomes shorter. H zone becomes smaller or disappears. I hand remains unchanged. More than one of these answers. 5. Which of the following is not a method of gradation of skeletal muscle contraction? 3': 9. ,5. twitch summation motor unit recruitment stimulating variable portions of each motor unit varying the number of motor units stimulated varying the frequency at which a motor unit is stimulated 6. The l band of the sarcomere is characterized by a. overlapping thin and thick filaments. b. only thick filaments. @ only thin filaments. d. a very dark coloration. e. None of these answers. 7. A functional syncytium af refers to a pair of antagonistic muscles that function together to move a joint in two opposite directions. (3 can be excited to contract as a unit because action potentials can be conducted from one cell to adjacent cells through gap junctions. ‘ .9: is found only in smooth muscle. d. More than one of these. e. None of these answers. 8. The AV nodal delay . a. ensures that the atria contract and empty their contents into the ventricles prior ' to ventricular systole. /b’. ensures that the ventricles contract prior to atrial systole. e. ensures that tetanic contraction of cardiac muscle is impossible. d. is shortened by-parasympathetic stimulation. e. More than one of the above is correct. 9. Select the vessel carrying blood with a comparatively high concentration of oxygen. a. chordae tendineae. b”. inferior vena cava. pulmonary artery. { ~ I add pulmonary vein. g4 superior vena cava. 1 0. During the isovolumetric phase of ventricular systole: a, volume within the ventricles is constant. ,b. the atrioventricular valves and semilunar valves are closed. c. blood is ejected into the great vessels. d. the ventricles are relaxing. @ Both (a) and (b) above. 11. The fastest rateof autorhythmicity is normally carried out by the AV bundle. AV node. bundle of His. a. b. c. d. Purkinje fibers. @ SA node. 1'9 a. b. c. @ e. (a. b. c. d. e. .a. g. .C. d. 2. The second heart sound is produced by the opening of the AV valves. closing of the AV valves. opening of the semiiunar valves. closing of the semilunar valves. blood rushing through the AV valves during diastole, creating a turbulent flow. 13. Theficardiac output is equal to the difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV) x HR. the product of heart rate and EDV. the difference between the stroke. volume at rest and the stroke volume during exercise. the stroke volume less the end-systolic volume. the product of heart rate and blood pressure. 14. Sympathetic stimulation of the heart increases the heart rate. increases the contractile strength of the heart muscle. shifts the Frank-Starting curve to the left. Two of these answers. All of these answers. 15. Which of the following willmtincrease stroke volume? increased end-diastolic volume increased contractility of the heart increased end-systolic volume increased stretch of the cardiac muscle fibers during ventricular filling increased venous return their radii cannot be changed. their walls contain a thick layer of smooth muscle. they are responsible for the distribution of blood flow to the various organs. they are the major vessels that contribute to total peripheral resistance. .a. (g. ,d./ ,9: \fiéWh‘Ech of the following properties doesnot pertain to the arterioles? Cc) ,d. ,e: they are richly innervated by sympathetic nerve fibers. 17. The end-systolic volume is @ b. C. d. e/ the volume of blood in the ventricle when filling is complete. always equal to the stroke volume. '_ the volume of blood in the ventricle when ejection is completeffand always equal to the stroke volume. 4'“ the volume of blood in the ventricle when filling is complete and always equal to the stroke volume. the volume of blood in the ventricle when ejection is complete" t- c. d. e. asset‘s 999V@ 2: @ g, a. c. d. ( e1: 8. Heart valves and venous valves serve a similar function. They prevent a’ flow of blood. forward backward turbulent pulsatile laminar 19. Which statement regarding sympathetic stimulation effects on blood pressure is incorrect? vasoconstriction of arterioles increases total peripheral resistance. decreased end diastolic volume increases cardiac output. increased stroke volume increases cardiac output. vasoconstriction of veins increases venous return vasoconstriction of veins increases stroke volume. 20. The major site of sympathetic blood flow control (resistance changes) is at the arterioles. capillaries. metarterioles. arteries. None of these answers. . A sudden increase in pressure within the carotid sinus leads to increased sympathetic nerve activity. increased sympathetic nerve activity and decreased parasympathetic nerve activity. decreased sympathetic nerve activity and increased parasympathetic nerve activity. decreased sympathetic nerve activity. None of these answers. In addition to transporting oxygen hemoglobin transports some carbon dioxide. nirtic oxide. buffered hydrogen ions. Both (a) and (b) above. All these answers. 23. Depolarization of the ventricles is represented on an electrocardiogram by the a. b. c. e. P wave. T wave. S wave. QRS complex. PR complex. al 24. Afferent arteriolar vasoconstriction blood flow into the glomerulus, which causes the glomerular-capillary blood pressure to A“, \ . leading to a(n) g‘ go in the net filtration pressure and a resultant in the GFR. é c. .d. e. increases, increase, increase, increase decreases, decrease, decrease, decrease increases, increase, decrease, decrease decreases, decrease, increase, increase None of these answers. 25. Glomeruiar filtration 6 42.” d. e. occurs in the loop of Henle. is the process by which plasmawwater, electrolytes, and small molecules, which enter Bowman's capsule, are separated'from blood cells and protein, which remain in the glomerular capillaries. is the process by which a substance is transported from the tubular fluid to the peritubular capillaries. Both (a) and (b) above. None of these answers. 26. Water reabsorption is under the control of vasopressin a. b. (d) d. e. along the entire length of the nephron. only in the loop of Henle. only in the distal and collecting tubules. only in the proximal tubule. only in the glomerulus. 27. Which of the following is not a function of the kidneys? M @xi‘e 28. W hi @2 Q excretionof metabolic wastes. maintaining proper plasma volume. secreting aldosterone to regulate sodium. maintains proper osmolarity of body fluids. assisting in maintaining the proper acid-base balance of the body. ch of the following stimulatesaldosterone secretion? an increase in plasma K+. a decrease in plasma K+. activation of the renin-angiotensin pathway. Both (a) and (c) above. Both (b) and (0) above. 29. The segment of the nephron that is not permeable to H2O even in the presence of vasopressin is the a. C4» c. d. e. proximal tubule. ascending limb of the loop of Henle. descending limb of the loop of Henle. distal tubule. collectino tubule. _ -- djustments in blood pressure are mediated by baroreceptor reflexes. changes in cardiac output. renal activity WM Sit/(M Both (a) and (b) above. Both (b) and (0) above. 31 .. Would you like to have your scored scantron left outside Bri your convenience? a. Yes. b. No, I would rather pick up my scantron in person. Please indicate on your scantron that you took Testform D. 993 185b for you to pick up at ...
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NPB101-Usrey-Debello-MII - NPB 101— Exam 2 Winter 2003...

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