Which chamber receives oxygenated blood from the pulmonary circuit?
A) 5
B) 10
C) 16
D) 13
E) both 5 and 16
Answer: C
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Guinea pigs have how many teeth?
A) 12 B) 16 C) 18 D) 20
Chemical barriers composed of phospholipid bilayers form within biological systems because
A. the inability of the polar heads to dissolve in water causes the heads to adhere to one another. B. hydrophobic exclusion results in the close positioning of the nonpolar tails. C. van der Waals forces attract the polar heads to the water inside the cell. D. cells expend ATP to position the phospholipid tails close together.
You've just stepped on the treadmill and are beginning to increase your speed. As you reach your maximum, which of the following values will NOT increase?
A. Body heat production B. Oxygen extraction from the blood by muscles C. Arterial PCO2 D. Minute ventilation E. Oxygen delivery to muscles
Blood vessels enter the eye and nerve processes exit the eye at the
A. optic disc. B. macula lutea. C. sensory retina. D. fovea centralis. E. pupil.