Question 1

According to Dalton's Law of Partial Pressures, what is the total pressure exerted by a mixture of gases?

Accepted Answer

It is equal to the sum of the partial pressures exerted by each gas in the mixture: $$P_{total} = P_1$ + P_2$ + ... + P_n$$

Question 2

A patient is experiencing hypoventilation. Which of the following changes in blood gases and pH would you expect?

Accepted Answer

Increased $$P_{CO_2$}$$, decreased blood pH (acidosis)

Question 3

Which of the following best explains why carbon monoxide (CO) poisoning is so dangerous?

Accepted Answer

CO binds to hemoglobin with a much higher affinity than oxygen, preventing oxygen transport.

Question 4

During exercise, active tissues produce more $$CO_2$$ and $$H^+. $$How does this affect the oxygen-hemoglobin dissociation curve and oxygen delivery?

Accepted Answer

The curve shifts to the right, decreasing hemoglobin's affinity for oxygen and enhancing oxygen delivery to tissues.

Question 5

Which equation correctly represents the reversible reaction catalyzed by carbonic anhydrase in red blood cells?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-$$

Question 6

A person at high altitude is exposed to lower atmospheric $$P_{O_2$}. $$Which type of hypoxia are they most at risk for?

Accepted Answer

Hypoxemic hypoxia

Question 7

Which of the following best describes ventilation-perfusion coupling in the lungs?

Accepted Answer

It matches the amount of air reaching the alveoli to the amount of blood flow in the pulmonary capillaries.

Question 8

If alveolar $$P_{O_2$} is $$low, what happens to the diameter of the pulmonary arterioles supplying those alveoli?

Accepted Answer

They constrict to reduce blood flow.

Question 9

Which of the following statements about the solubility of gases in blood is correct?

Accepted Answer

Carbon dioxide is 20 times more soluble in water than oxygen.

Question 10

A patient with chronic obstructive pulmonary disease (COPD) has thickened respiratory membranes and reduced surface area. What is the most likely effect on external respiration?

Accepted Answer

Decreased rate of gas exchange due to impaired diffusion.

Question 11

Which form accounts for the majority of carbon dioxide transport in the blood?

Accepted Answer

As bicarbonate ion ($$HCO_3$$^-$$) in plasma

Question 12

Which of the following best describes the Bohr effect?

Accepted Answer

Increased $$CO_2$$ and $$H^+ in $$tissues weakens the hemoglobin-oxygen bond, enhancing oxygen unloading.

Question 13

Which neural structure is primarily responsible for setting the basic rhythm of breathing (eupnea)?

Accepted Answer

Ventral respiratory group (VRG) of the medulla

Question 14

A person is hyperventilating due to anxiety. What is the expected effect on blood $$CO_2$$ and pH?

Accepted Answer

Decreased $$CO_2$$, increased pH (alkalosis)

Question 15

Which of the following is NOT a cause of hypoxemia?

Accepted Answer

Excessive oxygen delivery to tissues

Question 16

Which of the following best describes the effect of temperature on gas solubility in blood?

Accepted Answer

As temperature increases, gas solubility decreases.

Question 17

Which of the following equations represents the carbonic acid-bicarbonate buffer system's response to increased $$H^+$$ concentration in blood?

Accepted Answer

$$H^+ + $$HCO_3$$^- \rightarrow H_2CO_3$$

Question 18

A patient with severe anemia has normal lung function and $$P_{O_2$}$$, but is still hypoxic. What is the most likely explanation?

Accepted Answer

Insufficient hemoglobin to carry adequate oxygen

Question 19

Which of the following best explains why alveolar air contains more $$CO_2$$ and water vapor than atmospheric air?

Accepted Answer

Gas exchange in the lungs, humidification of air, and mixing of alveolar gas with each breath

Question 20

Which of the following is a direct effect of increased $$P_{CO_2$} in $$arterial blood on the respiratory centers?

Accepted Answer

Increased rate and depth of breathing

The Respiratory System: Gas Exchange, Transport, and Regulation

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