Question 1

Which type of epithelial tissue lines the nasal cavity and most of the respiratory tract, and what is its primary function?

Accepted Answer

Pseudostratified ciliated columnar epithelium; traps and moves particles out of the airway

Question 2

During inhalation, which pressure is primarily responsible for drawing air into the lungs, and how is it generated?

Accepted Answer

Transpulmonary pressure ($P_{tp}$); generated by the difference between intrapulmonary and intrapleural pressures

Question 3

Which structure prevents the collapse of the trachea during breathing and what is its composition?

Accepted Answer

C-shaped rings of hyaline cartilage; maintain airway patency

Question 4

A patient suffers a pneumothorax. Which pressure changes would you expect to see in the pleural cavity?

Accepted Answer

Intrapleural pressure ($P_{ip}$) increases and approaches atmospheric pressure ($P_{atm}$)

Question 5

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

Accepted Answer

It decreases surface tension, preventing alveolar collapse during exhalation

Question 6

Which equation correctly represents the relationship between transpulmonary pressure, intrapulmonary pressure, and intrapleural pressure?

Accepted Answer

$P_{tp} = P_{pul} - P_{ip}$

Question 7

During forced exhalation, which muscles are primarily recruited to decrease thoracic volume?

Accepted Answer

Internal intercostals and abdominal muscles

Question 8

Which of the following best explains why bronchodilation occurs during sympathetic stimulation?

Accepted Answer

Sympathetic stimulation relaxes smooth muscle in bronchioles, increasing airway diameter

Question 9

A patient is experiencing difficulty breathing due to excess mucus production in the respiratory tract. Which cell type is most likely overactive?

Accepted Answer

Goblet cells

Question 10

Which of the following statements about alveolar ventilation is correct?

Accepted Answer

Alveolar ventilation is the volume of air that reaches the alveoli and participates in gas exchange

Question 11

Which of the following best describes the role of the respiratory mucosa?

Accepted Answer

It lines the nasal cavity and trachea, trapping particles and humidifying air

Question 12

Which of the following is a function of the cilia found in the respiratory tract?

Accepted Answer

Moving mucus and trapped particles toward the pharynx for removal

Question 13

Which of the following best explains the difference between the conducting and respiratory zones of the respiratory system?

Accepted Answer

The conducting zone includes the nasal cavity, pharynx, larynx, trachea, bronchi, and bronchioles, while the respiratory zone includes the respiratory bronchioles, alveolar ducts, and alveoli

Question 14

Which equation correctly calculates alveolar ventilation ($V_A$) given tidal volume ($V_T$), respiratory rate ($f$), and anatomical dead space ($V_D$)?

Accepted Answer

$V_A = (V_T - V_D) 	imes f$

Question 15

Which of the following would most likely increase airway resistance in the lower respiratory tract?

Accepted Answer

Constriction of smooth muscle in the bronchioles

Question 16

Which of the following is the correct sequence of airflow through the respiratory tract during inhalation?

Accepted Answer

Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Alveoli

Question 17

Which of the following best describes the function of the pleural fluid?

Accepted Answer

It lubricates the pleural surfaces, reducing friction during breathing

Question 18

Which volume is typically greatest in males compared to females, and what is its approximate value in healthy adult males?

Accepted Answer

Inspiratory reserve volume; about 3100 mL

Question 19

Which of the following is a primary function of the larynx?

Accepted Answer

Producing sound for speech

Question 20

Which of the following best describes the role of the respiratory system in acid-base balance?

Accepted Answer

It regulates blood pH by controlling the rate of carbon dioxide removal through ventilation

Respiratory System: Structure, Function, and Physiology Study Guide

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