Q: Which of the following equations correctly calculates the partial pressure of oxygen ($$P_{O_2$}) in $$atmospheric air at sea level (760 mm Hg), given that oxygen makes up 20.9% of air?

$$P_{O_2$} = 0.209 \times 760$$

Question 1

Which of the following best describes the ultimate goal of respiration in human physiology?

Accepted Answer

To produce ATP for energy and remove carbon dioxide waste

Question 2

During inspiration, which of the following events occurs in the thoracic cavity?

Accepted Answer

The size of the thoracic cavity increases and pressure decreases

Question 3

According to Boyle's Law, what happens to the pressure of a gas if its volume is doubled?

Accepted Answer

Pressure is halved

Question 4

A patient with asthma is experiencing bronchoconstriction. Which of the following substances would most likely help dilate their airways?

Accepted Answer

Epinephrine

Question 5

Which of the following best explains why surfactant is critical for normal lung function?

Accepted Answer

It reduces alveolar surface tension and prevents alveolar collapse

Question 6

A premature infant is diagnosed with Infant Respiratory Distress Syndrome (IRDS). What is the primary physiological problem?

Accepted Answer

Insufficient surfactant production leading to increased alveolar surface tension

Question 7

Which of the following equations correctly calculates the partial pressure of oxygen ($$P_{O_2$}) in $$atmospheric air at sea level (760 mm Hg), given that oxygen makes up 20.9% of air?

Accepted Answer

$$P_{O_2$} = 0.209 	imes 760$$

Question 8

A patient’s spirometry results show a decreased FEV/FVC ratio below 0.7. What does this most likely indicate?

Accepted Answer

Obstructive lung disease

Question 9

Which of the following is the best indicator of effective ventilation in the lungs?

Accepted Answer

Alveolar ventilation rate (AVR)

Question 10

A patient with chronic bronchitis has increased total lung capacity (TLC), functional residual capacity (FRC), and residual volume (RV). What type of pulmonary disease does this pattern suggest?

Accepted Answer

Obstructive pulmonary disease

Question 11

Which law states that the total pressure of a mixture of gases equals the sum of the partial pressures of the individual gases?

Accepted Answer

Dalton's Law

Question 12

During exercise, which of the following best describes the change in ventilation?

Accepted Answer

Ventilation increases abruptly, then gradually, and reaches a steady state

Question 13

Which of the following is a consequence of a pneumothorax?

Accepted Answer

Collapse of the lung due to loss of negative intrapleural pressure

Question 14

A patient is exposed to carbon monoxide. Why is this dangerous?

Accepted Answer

Hemoglobin has a 200x greater affinity for carbon monoxide than oxygen, reducing oxygen delivery

Question 15

Which of the following best describes the Bohr effect?

Accepted Answer

Increased carbon dioxide concentration and decreased pH weaken the hemoglobin-oxygen bond, promoting oxygen unloading

Question 16

Which equation represents the carbonic acid-bicarbonate buffer system in the blood?

Accepted Answer

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

Question 17

A patient with pulmonary fibrosis has decreased lung compliance. Which of the following spirometry findings would you expect?

Accepted Answer

Decreased total lung capacity (TLC)

Question 18

Which of the following is true regarding ventilation-perfusion (V/Q) coupling in the lungs?

Accepted Answer

Optimal gas exchange requires matching of alveolar ventilation with pulmonary blood perfusion

Question 19

Which of the following is a common cause of hypoxemic hypoxia?

Accepted Answer

Abnormal ventilation due to pulmonary disease

Question 20

Which of the following best describes the effect of rapid, deep breathing (hyperventilation) on blood pH?

Accepted Answer

Blood pH increases due to decreased CO$$_2$$

Respiratory Physiology: Structure, Function, and Clinical Relevance

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