The partial pressure of oxygen
a. in the atmospheric air averages 79 percent of total atmospheric pressure
b. in blood is the most important factor that determines percent O2 saturation of Hb
c. in arterial blood decreases when Hb preferentially combines with CO rather than O2
d. is both b and c
e. is none of the above
B
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Which of these results from hyperventilation? A) Increased alveolar PO2B) An increase in alveolar PCO2C) Decreased alveolar PCO2D) A decrease in alveolar PO2E) The same alveolar PCO2 as under normal conditions
What will be an ideal response?
Spermatogenesis begins
A) at puberty. B) during embryogenesis. C) at birth. D) at age 3. E) at age 7.
The cerebrospinal fluid is found in the brain, but not in the spinal cord
Indicate whether the statement is true or false
Which type of connective tissue stabilizes the positions of the vertebrae, cushions shocks, and permits expansion and contraction of organs?
A) elastic tissue B) dense irregular connective tissue C) dense regular connective tissue D) areolar tissue