The Living World 8th Edition by George Johnson

تمرين 11

Oxygen is transported by
A) hemoglobin in red blood cells.
B) dissolving it in the blood plasma.
C) binding to proteins in the blood plasma.
D) platelets in the blood plasma.
Most of the carbon dioxide is transported
A) by hemoglobin in red blood cells.
B) as bicarbonate in the blood plasma.
C) by proteins in the blood plasma.
D) as carbonic acid in red blood cells.
Which of the following is not carried by hemoglobin?
A) bicarbonate
B) carbon dioxide
C) oxygen
D) super nitric oxide
Explain what would happen to carbon dioxide transport if a person was poisoned with a chemical that blocked the actions of carbonic anhydrase.
If you hold your breath for a long time, body CO₂ levels are likely to ____, and the pH of body fluids is likely to ____.
A) increase; increase
B) decrease; increase
C) increase; decrease
D) decrease; decrease
Mountain climbers may have difficulty at high elevations because
A) the partial pressure of oxygen is lower at higher elevations.
B) more CO₂ occurs at higher altitudes.
C) the concentration of all elements of the air is lower at higher elevations.
D) cooler temperatures restrict the metabolic activity of oxygen at high elevations.
Often people who appear to have drowned can be revived. In every case of full recovery after extended submergence, however, the person has been submerged in very cold water. Is this observation consistent with the fact that oxygen is twice as soluble in water at 0 ? C as it is at 3 ? C?