Which of the following best describes the effect that holding your breath has on blood pH?
A. Holding your breath increases blood pH by increasing the amount of carbon dioxide in the blood.
B. Holding your breath increases blood pH by decreasing the amount of carbon dioxide in the blood.
C. Holding your breath decreases blood pH by increasing the amount of carbon dioxide in the blood.
D. Holding your breath decreases blood pH by decreasing the amount of carbon dioxide in the blood.
Answer: A
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Which of the following is a thin layer of smooth muscle just beneath the skin of the scrotum?
A. Raphe B. Cremaster C. Tunica vaginalis D. Dartos muscle E. Inguinal muscle
During mild to moderate exercise, arterial pH, PO2, and PCO2 are ________.
A) almost twice as high as normal. B) nearly normal. C) nearly half of normal.
Which of the following conditions would cause an increase in the heart rate?
A) activation of the parasympathetic nervous system B) acetylcholine stimulation of nodal cells and contractile cells C) activation of the sympathetic nervous system D) decreased blood concentration of carbon dioxide and increased blood pressure E) decreased blood concentration of oxygen and increased blood pressure
What response would you expect after traveling to high altitude for two weeks?
A. Blood levels of oxygen would remain depressed for the duration. B. A surge in iron release from the liver would occur. C. The kidneys would secrete elevated amounts of erythropoietin. D. There would be no change in blood composition.