Q: Which equation best represents the process of diffusion during gas exchange in the lungs?

$$ \text{Rate of diffusion} = \frac{(P_1$ - P_2$) \times A}{d} $$

Question 1

Which of the following best describes the function of pulmonary surfactant in the alveoli?

Accepted Answer

It reduces surface tension, preventing alveolar collapse.

Question 2

A patient presents with difficulty breathing and cyanosis. Which alteration in respiratory function is most likely responsible for these symptoms?

Accepted Answer

Hypoxia

Question 3

Which of the following is NOT a component of the upper airway?

Accepted Answer

Trachea

Question 4

During inspiration, which of the following occurs to facilitate pulmonary ventilation?

Accepted Answer

The external intercostal muscles contract, lifting the ribs upward and outward.

Question 5

Which equation best represents the process of diffusion during gas exchange in the lungs?

Accepted Answer

$$ 	ext{Rate of diffusion} = \frac{(P_1$ - P_2$) 	imes A}{d} $$

Question 6

A patient with thickening of the alveolar-capillary membrane is most likely to experience which of the following?

Accepted Answer

Decreased diffusion of gases

Question 7

Which of the following statements about oxygen transport is correct?

Accepted Answer

Hemoglobin carries oxygen as oxyhemoglobin.

Question 8

A 70-year-old patient presents with a barrel chest and prominent bony landmarks. Which age-related change is most likely responsible for these findings?

Accepted Answer

Loss of subcutaneous fat and rigidity of airways

Question 9

Which of the following is a plausible consequence of hypoventilation?

Accepted Answer

Decreased rate or depth of air movement into the lungs

Question 10

Which of the following breath sounds is most likely to be heard over the trachea and is described as high-pitched and longer?

Accepted Answer

Bronchial

Question 11

A patient is prescribed a bronchodilator via a dry powder inhaler. Which statement best describes the mechanism of this device?

Accepted Answer

It is breath-activated and delivers medication when the patient inhales.

Question 12

Which of the following is a primary function of the lower airway?

Accepted Answer

Conduct air, mucociliary clearance, and production of pulmonary surfactant

Question 13

A patient with myocardial ischemia is most likely to experience which of the following symptoms?

Accepted Answer

Chest pain due to reduced blood flow to the heart muscle

Question 14

Which of the following values measured in pulmonary function tests represents the maximum flow attained during a forced expiratory maneuver?

Accepted Answer

Peak expiratory flow rate (PEFR)

Question 15

A nurse is caring for a patient with a chest tube. Which of the following actions is essential to maintain the patency and integrity of the drainage system?

Accepted Answer

Checking the dressing and monitoring respiratory status

Question 16

Which of the following is a precaution for oxygen administration?

Accepted Answer

Avoiding open flames in the patient’s room

Question 17

A patient is experiencing wheezes during auscultation. Which of the following best explains the cause of this abnormal breath sound?

Accepted Answer

Air passing through airways constricted by swelling, narrowing, secretions, or tumors

Question 18

Which of the following is the correct formula for calculating vital capacity (VC) in pulmonary function tests?

Accepted Answer

$$ VC = TV + IRV + ERV $$

Question 19

A patient is prescribed an expectorant. What is the primary purpose of this medication?

Accepted Answer

Loosen and clear mucus from the airways

Question 20

Which of the following best describes perfusion in the context of respiratory physiology?

Accepted Answer

The process by which oxygenated capillary blood passes through body tissues

Ch 40: Oxygenation and Perfusion

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