101midii08 - 1 Consider the kidney in a normal 60 kg human...

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1. Consider the kidney in a normal 60 kg human. If mean renal arterial blood pressure = 110 mmHg, mean renal venous blood pressure = 10 mmHg, and total renal blood flow = 1000 ml/min, total renal vascular resistance is? a. 10.0 mmHg/ml/min. b. 1.0 mmHg/ml/min. c. 0.1 mmHg/ml/min . d. 0.02 mmHg/ml/min. e. none of the above 2. In the systemic circulation the veins contain the largest percentage of the total blood volume because… a. The veins are the highest pressure blood vessels. b. The veins have the greatest cross-sectional of all the types of blood vessels. c. The veins are specialized for diffusive exchange of materials between blood and the tissues. d. The veins are more compliant than arteries at low transmural pressures. e. None of the above 3. Application of a drug that decreased K+ permeability during phase 4 of the Sino-Atrial (SA) nodal action potential would be expected to… a. decrease the slope of the pacemaker potential. b. cause bradycardia. c. cause a positive inotropic response in the SA node cells. d. increase heart rate e. a and d 4. The Sino-Atrial node is the normal cardiac pacemaker because… a. Phase 0 (Zero) of the SA nodal action potential is caused by extremely rapid Na+ influx through fast sodium channels. b. increased K+ permeability causes repolarization of SA nodal cells during Phase 3. c. the SA node has the highest natural rate of spontaneous action potential generation of all potentially self-excitatory cardiac tissues. d. the SA Node is located in the Interventricular Septum. e. none of the above 5. Which of the following is/are true of both cardiac and skeletal muscle myofibers?
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a. Release of Ca++ from the SR (Sarcoplasmic Reticulum) during excitation-contraction coupling. b. Both are innervated by Sympathetic Nervous (SNS) fibers. c. Summation of force can occur in both as a result of an increase of frequency of stimulation. d. all of the above e. b and c 6. Consider the following values for a typical systemic capillary, Pcap = 20 mmHg; Pint = 0 mmHg; COPcap = 25 mmHg; COPint = 7 mmHg. Assume normal permeability and body temperature. One would expect… a. net capillary filtration b. net capillary reabsorption 7. During the normal cardiac cycle the period of time that elapses between the closure of the left and right AV (Atrio-Ventricular) valves and the
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101midii08 - 1 Consider the kidney in a normal 60 kg human...

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