What changes in the blood levels of respiratory gases result from hyperventilation?
A. Oxygen and carbon dioxide levels rise.
B. Oxygen and carbon dioxide levels fall.
C. Oxygen levels rise and carbon dioxide levels fall.
D. Oxygen levels do not change but carbon dioxide levels fall.
D
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The outermost layer of the heart is called the:
a. epicardium b. endocardium c. visceral pericardium d. both A and C above
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Indicate whether the statement is true or false