Question 1

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

Accepted Answer

Serving as the site of gas exchange between air and blood

Question 2

During inspiration, which sequence of events occurs in the thoracic cavity?

Accepted Answer

Diaphragm descends, thoracic cavity volume increases, intrapulmonary pressure drops

Question 3

Which equation represents the conversion of carbon dioxide to bicarbonate in the blood?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-}$$

Question 4

A patient with pneumonia has alveoli filled with fluid. What is the most direct consequence of this condition?

Accepted Answer

Impaired gas exchange between air and blood

Question 5

Which structure is responsible for voice production in the human respiratory system?

Accepted Answer

Vocal folds in the larynx

Question 6

What is the main reason why smoking leads to 'smoker’s cough'?

Accepted Answer

Smoking damages cilia in the bronchi and bronchioles, reducing their ability to sweep debris

Question 7

Which respiratory volume is defined as the amount of air that remains in the lungs after forceful expiration?

Accepted Answer

Residual volume (RV)

Question 8

If a person’s blood pH drops due to increased CO2, which physiological response is most likely to occur?

Accepted Answer

Rapid, deep breathing to decrease CO2 and raise pH

Question 9

Which of the following is NOT a function of the upper respiratory tract?

Accepted Answer

Exchanging gases between blood and tissues

Question 10

Which form accounts for the majority of carbon dioxide transport in the blood?

Accepted Answer

As bicarbonate ions ($$\mathrm{$$HCO_3$$^-}) in $$plasma

Question 11

A person inhales deeply and then exhales forcefully. Which respiratory capacity is being measured?

Accepted Answer

Vital capacity (VC)

Question 12

Which of the following best explains why antibiotics are not effective against the common cold?

Accepted Answer

The cold is caused by viruses, which antibiotics cannot target

Question 13

Which pressure relationship is necessary for air to flow into the lungs during inspiration?

Accepted Answer

Intrapulmonary pressure must be less than atmospheric pressure

Question 14

Which structure is NOT part of the lower respiratory tract?

Accepted Answer

Pharynx

Question 15

What is the anatomical dead space in the respiratory system?

Accepted Answer

The volume of air remaining in passageways that does not contribute to gas exchange

Question 16

Which of the following best describes the role of carbonic anhydrase in red blood cells?

Accepted Answer

It catalyzes the conversion of carbon dioxide and water to carbonic acid

Question 17

Which respiratory disorder is characterized by alveoli filling with fluid, leading to impaired gas exchange?

Accepted Answer

Pneumonia

Question 18

Which of the following is a real-life consequence of rapid, deep breathing (hyperventilation)?

Accepted Answer

Decreased CO2 in blood, leading to alkalosis

Question 19

Which of the following combinations correctly matches a respiratory volume with its definition?

Accepted Answer

Inspiratory reserve volume (IRV): amount of air that can be inspired after tidal volume

Question 20

Which of the following best describes the effect of the chloride shift during CO2 transport?

Accepted Answer

It allows bicarbonate ions to leave red blood cells while maintaining electrical neutrality

The Respiratory System: Structure, Function, and Gas Exchange

Study Guide - Practice Questions