Question 1

Which of the following structures is the final destination for air during inhalation in the respiratory system?

Accepted Answer

Alveoli

Question 2

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

Accepted Answer

It decreases the surface tension, preventing alveolar collapse.

Question 3

A patient with chronic bronchitis is likely to experience which of the following changes in their respiratory system?

Accepted Answer

Increased airway resistance due to inflammation and mucus production.

Question 4

Which equation correctly represents Boyle's Law as it applies to pulmonary ventilation?

Accepted Answer

$P_1V_1 = P_2V_2$

Question 5

During inspiration, which muscles contract to increase thoracic volume?

Accepted Answer

Diaphragm and external intercostals

Question 6

A patient has a tidal volume (TV) of 500 mL and a respiratory rate of 12 breaths per minute. What is their minute ventilation?

Accepted Answer

$500 	imes 12 = 6000$ mL/min

Question 7

Which of the following best explains why oxygen diffuses from alveoli into pulmonary capillaries?

Accepted Answer

Partial pressure of oxygen is higher in the alveoli than in the capillaries.

Question 8

Which of the following is NOT a function of the larynx?

Accepted Answer

Gas exchange

Question 9

A restrictive pulmonary disorder is characterized by which of the following changes in lung volumes?

Accepted Answer

Decreased vital capacity (VC)

Question 10

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

Accepted Answer

It decreases friction, allowing smooth movement of the lungs during breathing.

Question 11

According to Dalton's Law, how is the total pressure of a mixture of gases determined?

Accepted Answer

By adding the partial pressures of each gas

Question 12

Which of the following changes would most likely increase airway resistance?

Accepted Answer

Bronchoconstriction

Question 13

A patient with emphysema is expected to have which of the following changes in their lung function?

Accepted Answer

Decreased alveolar surface area for gas exchange

Question 14

Which of the following equations represents Henry's Law?

Accepted Answer

$C = kP$

Question 15

During forced expiration, which muscles are primarily involved?

Accepted Answer

Internal intercostals and abdominal muscles

Question 16

Which of the following best describes the anatomical difference between the right and left lung?

Accepted Answer

The right lung has three lobes, while the left lung has two.

Question 17

A patient’s spirometry results show a decreased FEV1/FVC ratio. Which condition is most likely present?

Accepted Answer

Obstructive pulmonary disease

Question 18

Which of the following is a direct effect of increased carbon dioxide levels in the blood on respiration?

Accepted Answer

Increased respiratory rate

Question 19

Which of the following best explains the difference between atmospheric and alveolar air?

Accepted Answer

Alveolar air contains more carbon dioxide and less oxygen than atmospheric air.

Question 20

A climber at high altitude experiences increased ventilation. Which physiological mechanism best explains this response?

Accepted Answer

Decreased arterial oxygen partial pressure stimulates peripheral chemoreceptors.

Study Guide: The Respiratory System (Anatomy & Physiology)

Study Guide - Practice Questions