Question 1

Which of the following best describes the function of the upper respiratory system?

Accepted Answer

Filter, warm, and humidify incoming air to protect the lower respiratory system and facilitate smell

Question 2

What is the primary function of the respiratory mucosa lining the conducting portion of the respiratory system?

Accepted Answer

Produce mucus to trap foreign particles and moisten the air

Question 3

Which type of epithelium lines the alveoli and is specialized for gas exchange?

Accepted Answer

Simple squamous epithelium

Question 4

During swallowing, which structure folds down to prevent entry of food and liquids into the respiratory tract?

Accepted Answer

Epiglottis

Question 5

Which process is described by the movement of air in and out of the lungs?

Accepted Answer

Pulmonary ventilation

Question 6

Boyle’s Law states that the pressure of a gas varies inversely with its volume. Which equation represents this relationship?

Accepted Answer

$$P 	imes V = k$$

Question 7

Which of the following is NOT a function of surfactant in the lungs?

Accepted Answer

Facilitates gas exchange by increasing alveolar surface area

Question 8

A patient with restrictive lung disease is most likely to experience which of the following?

Accepted Answer

Decreased pulmonary compliance and reduced effectiveness of inspiration

Question 9

Which of the following is the correct sequence for the passage of inhaled air from the nose to the alveolar sacs?

Accepted Answer

Nasal cavity → Pharynx → Larynx → Trachea → Primary bronchi → Secondary bronchi → Tertiary bronchi → Bronchioles → Terminal bronchioles → Respiratory bronchioles → Alveolar ducts → Alveolar sacs

Question 10

Which of the following best explains why the trachea is reinforced with C-shaped rings of hyaline cartilage?

Accepted Answer

To keep the trachea open for air passage while allowing flexibility for food passage in the esophagus

Question 11

Which of the following is a consequence of hypercapnia?

Accepted Answer

Acidosis (pH \u003c 7.35)

Question 12

Which respiratory center in the brain determines the base respiratory rate and functions during every respiratory cycle?

Accepted Answer

Ventral Respiratory Group (VRG)

Question 13

Which of the following is the main mechanism by which carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ions in blood

Question 14

During quiet breathing (eupnea), which muscles are primarily responsible for inhalation?

Accepted Answer

Diaphragm and external intercostal muscles

Question 15

Which equation represents the conversion of carbon dioxide and water into carbonic acid in erythrocytes?

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_2\mathrm{CO}_3$$

Question 16

Which of the following best describes the function of alveolar macrophages?

Accepted Answer

Engulf small particles that reach the lungs

Question 17

A patient with asthma is experiencing bronchoconstriction, inflammation, and increased mucus production. Which type of lung disease is this?

Accepted Answer

Obstructive lung disease

Question 18

Which physical factor is most directly reduced by surfactant in the alveoli?

Accepted Answer

Alveolar surface tension

Question 19

Which of the following best describes the direction of gas diffusion during pulmonary gas exchange?

Accepted Answer

Oxygen diffuses from alveolar air to blood; carbon dioxide diffuses from blood to alveolar air

The Respiratory System: Structure, Function, and Physiology

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