Air consists of about 78.6% nitrogen, 20.9% oxygen, 0.04% carbon dioxide, and 0.5% water. At sea level, (760 mmHg) what is the PCO2?
A. 3.7 mm Hg
B. 159 mm Hg
C. 597 mm Hg
D. 0.3 mm Hg
Answer: D
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The respiratory center is most likely to increase the breathing rate if the
A. pH of body fluids is decreasing. B. pH of body fluids is increasing. C. concentration of carbonic acid is decreasing. D. concentration of sodium bicarbonate is increasing.
Answer the following statements true (T) or false (F)
1. When the ratio of the buffer pair falls below what it should be, uncompensated metabolic acidosis can occur. 2. In cardiac arrest, the lack of respiration causes a rapid onset of respiratory acidosis. 3. In cardiac arrest, the buffer system in the blood is overwhelmed and is unable to restore the proper blood pH. 4. Pure water with a pH of 7.0 would have neither hydrogen nor hydroxide ions. 5. The lungs remove just under 10 liters of carbonic acid from the venous blood each day.
If L = load, F = fulcrum, and E = effort, what type of lever system is described as LEF?
A) third-class lever B) second-class lever C) fourth-class lever D) first-class lever
Vasa recta are associated with
a. afferent arterioles b. efferent arterioles c. cortical nephrons d. juxtamedullary nephron e. renal papillae