Exam 17: The Respiratory System: Gas Exchange and the Regulation of Breathing

As blood flows through systemic capillaries, carbonic acid dissociates into a bicarbonate ion and a hydrogen ion within the erythrocyte; the bicarbonate is moved out by the chloride shift while the hydrogen ion binds with hemoglobin.

At sea level the air pressure which equals 1 atmosphere is

The Bohr effect describes the effects of pH on the affinity of hemoglobin for oxygen.

The chemoreceptor reflex regulates ventilation primarily through sensing changes in blood PO2.

Oxygen is much more soluble in aqueous solution than carbon dioxide.

What percentage of air is oxygen?

The resistance of the airways is controlled by bronchioles that are sensitive to changes in PCO2.

Dalton's law describes the solubility of a gas in a liquid.

The is the respiratory center that appears to facilitate the transition between inspiration and expiration.

What is the primary mechanism of carbon dioxide transport in blood?

There is a substantial safety margin for the uptake of gases in the alveolus because at rest, blood is completely oxygenated after traveling only 1/3 the length of the pulmonary capillary bed.

The reaction catalyzed by carbonic anhydrase is an irreversible reaction.

At equilibrium, the gas molecules that dissolve in solution and those that remain in the gaseous phase are, by definition, at the same

A local bronchodilation within the alveolus will result in a(n)in the ventilation- perfusion ratio in that region. A vasoconstriction of pulmonary arteriole diameter will result in a(n)in the ventilation- perfusion ratio in that region.

As humidity increases, the partial pressure of oxygen in air

Which of the following will cause a shift in the hemoglobin- oxygen dissociation curve to the right?

Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in systemic veins?

The relationship between the concentration of a gas in solution and the partial pressure of that gas can be described by

What is the definition of anemia?

In the pulmonary arteries, the partial pressure of oxygen is approximately , and hemoglobin is approximately saturated with oxygen.