Question 1

Which of the following best describes the function of surfactant produced by pneumocytes type II in the alveoli?

Accepted Answer

Surfactant decreases the surface tension of alveolar fluid, keeping alveoli open for gas exchange.

Question 2

A patient with severe bronchoconstriction due to asthma is experiencing difficulty breathing. Which mechanism is primarily responsible for this condition?

Accepted Answer

Excessive stimulation of airway smooth muscle by parasympathetic activation or histamine release.

Question 3

During inhalation, which of the following accurately describes the relationship between pressure and volume in the lungs according to Boyle’s law?

Accepted Answer

As lung volume increases, intrapulmonary pressure decreases.

Question 4

Which anatomical structure prevents food and liquids from entering the respiratory tract during swallowing?

Accepted Answer

Epiglottis

Question 5

A patient presents with pneumonia. Which of the following best explains how pneumonia compromises gas exchange in the lungs?

Accepted Answer

Pneumonia causes fluid buildup and inflammation, increasing the thickness of the blood-air barrier.

Question 6

Which of the following equations correctly represents Boyle’s law as it applies to pulmonary ventilation?

Accepted Answer

$$P = \frac{1}{V}$$

Question 7

Which of the following is NOT a function of the respiratory mucosa?

Accepted Answer

Producing surfactant to reduce surface tension

Question 8

A patient suffers a pneumothorax after a chest injury. What is the immediate physiological consequence?

Accepted Answer

Collapse of the lung due to loss of fluid bond between pleurae

Question 9

Which of the following muscles is primarily responsible for quiet, resting inhalation?

Accepted Answer

Diaphragm

Question 10

Which of the following statements about the left lung is correct?

Accepted Answer

The left lung is longer than the right lung and has a cardiac notch.

Question 11

Which of the following best describes the functional division of the respiratory tract?

Accepted Answer

The conducting portion extends from the nasal cavity to the larger bronchioles.

Question 12

A patient with reduced mobility of the thoracic cage due to injury is likely to experience which of the following?

Accepted Answer

Decreased compliance, making it harder to fill the lungs

Question 13

Which of the following structures is NOT part of the upper respiratory system?

Accepted Answer

Larynx

Question 14

During forced exhalation, which muscles are actively involved?

Accepted Answer

Internal intercostals and abdominal muscles

Question 15

Which of the following best explains why breathing through the mouth bypasses important steps in air conditioning?

Accepted Answer

The mouth lacks nasal conchae and highly vascularized lamina propria to warm and humidify air.

Question 16

Which of the following is a correct description of the blood-air barrier in the alveoli?

Accepted Answer

It consists of the alveolar cell layer, capillary endothelial layer, and fused basement membrane.

Question 17

Which of the following would most likely result in increased resistance to airflow in the respiratory tract?

Accepted Answer

Bronchoconstriction due to parasympathetic activation or histamine release

Question 18

Which of the following is TRUE regarding the right lung?

Accepted Answer

The right lung is displaced upward by the liver and has three lobes.

Question 19

A patient with respiratory distress syndrome is most likely experiencing which of the following?

Accepted Answer

Collapse of alveoli after each exhalation due to inadequate surfactant

Question 20

Which of the following best describes the process of articulation in speech production?

Accepted Answer

Modification of sound with lips, tongue, and teeth to form words

The Respiratory System: Structure, Function, and Pulmonary Ventilation

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