sample_midterm_ii

sample_midterm_ii - 1. Consider a sample of normal human...

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58% plasma. This blood would… a. have a hematocrit of about 42. b. would contain about 40% leukocytes by volume. c. would contain about 40% platelets by volume. d. would contain over 40% erythrocytes by volume. e. a and d $ 2. In the systemic circulation the distribution of total blood volume is such that… a. Capillaries have the highest blood volume because, even though they are very small, they are very numerous. b. Arteries have the highest blood volume because they are very elastic. c. Veins have the highest blood volume because they are very compliant over a normal range of transmural pressures. $ d. All of the above e. None of the above 3. Application of a drug which increased K+ (potassium) permeability during phase 4 of the Sino-Atrial nodal action potential would be expected to… a. decrease the slope of the pacemaker potential. b. cause a decrease in heart rate. c. cause a positive inotropic response in SA nodal cells. d. a and b $ e. all of the above 4. Considering all the potentially self-excitatory tissue in the heart, the Sino-Atrial node is the normal cardiac pacemaker because… a. phase zero of the SA nodal action potential is caused by rapid Na+ influx. b. increased Ca++ (calcium) permeability causes repolarization of SA nodal cells. 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 the only potential cardiac pacemaker innervated by motor nerves. e. none of the above 5. Cardiac muscle differs from skeletal muscle in that… a. there is no release of Ca++ from the SR (Sarcoplasmic Reticulum) during excitation-contraction coupling in cardiac myofibers. b.
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sample_midterm_ii - 1. Consider a sample of normal human...

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