Question 1

Which of the following best describes the primary function of the alveoli in the respiratory system?

Accepted Answer

To facilitate the exchange of gases between air and blood

Question 2

A patient presents with difficulty breathing and stabbing pain in the chest. Upon examination, air is found in the pleural space. What is the most likely diagnosis?

Accepted Answer

Pneumothorax

Question 3

Which structure prevents food from entering the trachea during swallowing?

Accepted Answer

Epiglottis

Question 4

What is the main reason supplemental oxygen is humidified before administration to patients?

Accepted Answer

To prevent dehydration of the respiratory mucosa

Question 5

Which equation correctly represents the calculation of vital capacity (VC) in pulmonary function testing?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 6

A child aspirates a small toy. In which bronchus is the object most likely to lodge, and why?

Accepted Answer

Right primary bronchus, because it is more vertical

Question 7

Which of the following is the most important muscle of inspiration?

Accepted Answer

Diaphragm

Question 8

What is the primary function of the cilia in the respiratory mucosa?

Accepted Answer

To move mucus and trapped particles toward the pharynx

Question 9

Which breathing pattern is characterized by cycles of alternating apnea and hyperventilation, often seen in critical conditions?

Accepted Answer

Cheyne-Stokes respiration

Question 10

A premature infant is diagnosed with infant respiratory distress syndrome (IRDS). What is the underlying cause of this condition?

Accepted Answer

Lack of surfactant production in the alveoli

Question 11

Which of the following best explains why breathing through the nose is more effective at humidifying air than breathing through the mouth?

Accepted Answer

The conchae increase surface area and exposure to mucous membrane

Question 12

Which of the following is NOT a function of the paranasal sinuses?

Accepted Answer

Gas exchange

Question 13

Which of the following statements about the transport of carbon dioxide in the blood is correct?

Accepted Answer

Most carbon dioxide is transported as bicarbonate ions

Question 14

A patient with chronic bronchitis and emphysema is most likely to be diagnosed with which of the following?

Accepted Answer

Obstructive pulmonary disorder (COPD)

Question 15

Which of the following best describes the role of surfactant in the alveoli?

Accepted Answer

It reduces surface tension to prevent collapse

Question 16

Which of the following is a function of the pharynx?

Accepted Answer

Passageway for food and air

Question 17

Which of the following breathing patterns is defined as labored or difficult respirations?

Accepted Answer

Dyspnea

Question 18

Which of the following is the correct sequence of airflow during inspiration?

Accepted Answer

Nose → Pharynx → Larynx → Trachea → Bronchi → Alveoli

Question 19

Which of the following is the main function of the pleural fluid in the intrapleural space?

Accepted Answer

To reduce friction between the lungs and chest wall

Question 20

Which of the following best describes the role of the medullary rhythmicity area in respiration?

Accepted Answer

It produces the normal rate and depth of respirations

The Respiratory System: Structure, Function, and Clinical Conditions

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