The cardiac muscle
a. extracts oxygen and nutrients from the blood within its chambers
b. receives its blood supply primarily during ventricular systole when blood is forced into coronary arteries
c. receives its blood supply directly from the pulmonary circulation as all of this blood passes through the coronary circulation
d. receives most of its blood supply during ventricular diastole by means of coronary arteries
e. does not receive blood in any of the ways mentioned above
D
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Which of the following bones forms the back and base of the cranium?
A. Mandible B. Ethmoid C. Occipital D. Temporal
Which of the following is not a method for regulating the hydrogen ion concentration in blood?
A) chemical buffer systems B) diet C) respiratory changes D) renal mechanism
At the onset of ventricular diastole, the A-V valves close as a result of
a. higher pressure in the atria relative to the ventricles. b. higher pressure in the ventricles relative to the atria. c. higher pressure in the arteries (pulmonary and aorta) relative to the ventricles. d. higher pressure in the venae cavae relative to the atria. e. contraction of the small muscles which attach to the valves.
In the filtration experiment, which substances passed through the filter paper because of their small molecular size?
A. Water, glucose, and starch B. Water, starch, and charcoal C. Water and glucose D. Water, glucose, starch, and charcoal E. Starch and charcoal