Blood oxygen levels
A. are more important than carbon dioxide levels in the regulation of respiration.
B. need to change only slightly to cause a change in respiration rate.
C. within the normal PO2 range have little effect on regulation of respiration.
D. in venous blood and arterial blood are about the same.
E. never change enough to influence respiration.
C
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The QRS complex of an ECG corresponds to
A) the repolarization of the ventricles. B) the progressive wave of ventricular depolarization. C) atrial repolarization. D) the depolarization of the atria. E) None of the answers are correct.
B and T cells that are no longer needed undergo ____________________ to ensure that a specific immune response is self-limiting
Fill in the blank(s) with correct word
The aorta terminates when it divides into the ________
A) femoral arteries B) common iliac arteries C) common carotid arteries D) great saphenous arteries
Hemoglobin can carry both oxygen and carbon dioxide in the blood.
Indicate whether the statement is true or false.