Q: According to Dalton’s Law, what is the partial pressure of oxygen ($$P_{O_2$}) in $$dry atmospheric air at sea level (760 mmHg) if oxygen makes up 20.93% of the air?

$$P_{O_2$} = 760 \times 0.2093 = 159.07$$ mmHg

Question 1

A patient is experiencing rapid, shallow breathing after a panic attack. Which term best describes this breathing pattern?

Accepted Answer

Tachypnea

Question 2

According to Dalton’s Law, what is the partial pressure of oxygen ($$P_{O_2$}) in $$dry atmospheric air at sea level (760 mmHg) if oxygen makes up 20.93% of the air?

Accepted Answer

$$P_{O_2$} = 760 	imes 0.2093 = 159.07$$ mmHg

Question 3

Which of the following best explains why CO2 is transported in higher concentrations in plasma than O2, even when both have the same partial pressure?

Accepted Answer

CO2 is more soluble in plasma than O2

Question 4

A scuba diver surfaces too quickly and develops joint pain and dizziness. What is the physiological cause of these symptoms?

Accepted Answer

Rapid decrease in dissolved nitrogen causing bubble formation in tissues

Question 5

Which equation correctly represents the total pressure of a gas mixture according to Dalton’s Law?

Accepted Answer

$$P_{total} = P_1$ + P_2$ + P_3$ + ... + P_n$$

Question 6

If a patient is hypoventilating, what changes would you expect in arterial blood gases?

Accepted Answer

Increased $$P_{CO_2$}$$ and decreased pH

Question 7

Which of the following would cause a rightward shift in the oxyhemoglobin dissociation curve?

Accepted Answer

Increased temperature

Question 8

A patient with severe emphysema has a decreased surface area for gas exchange. Which of the following is most likely to occur?

Accepted Answer

Decreased arterial $$P_{O_2$}$$ and increased arterial $$P_{CO_2$}$$

Question 9

Which of the following best describes the Bohr effect?

Accepted Answer

Increased $$P_{CO_2$} or $$decreased pH reduces hemoglobin’s affinity for O2

Question 10

A patient is placed in a hyperbaric oxygen chamber. What happens to the amount of oxygen dissolved in their plasma?

Accepted Answer

It increases due to higher $$P_{O_2$}$$

Question 11

Which of the following is the primary way CO2 is transported in the blood?

Accepted Answer

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

Question 12

If the partial pressure of oxygen in alveolar air is 100 mmHg and in the pulmonary capillary blood is 40 mmHg, in which direction will oxygen diffuse?

Accepted Answer

From alveolar air into the blood

Question 13

Which of the following best describes the Haldane effect?

Accepted Answer

Deoxygenated hemoglobin has a higher affinity for CO2

Question 14

A patient is experiencing hypoxemia. Which of the following best describes this condition?

Accepted Answer

A deficiency of oxygen in the blood

Question 15

Which of the following is the correct formula for the Henderson-Hasselbalch equation as it relates to blood pH?

Accepted Answer

$$pH = 6.1 + \log \left( \frac{[$$HCO_3$$^-]}{[CO_2$]} \right)$$

Question 16

Which of the following would most likely occur during hyperventilation?

Accepted Answer

Decreased arterial $$P_{CO_2$}$$ and increased blood pH

Question 17

A person with a blood pH of 7.30 is experiencing which condition?

Accepted Answer

Acidosis

Question 18

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

Accepted Answer

Stimulation of central chemoreceptors to increase ventilation

Question 19

If a person’s hemoglobin is 75% saturated in venous blood, what is the approximate $$P_{O_2$} in $$that blood?

Accepted Answer

40 mmHg

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