Question 1

Which of the following best describes the process of external respiration?

Accepted Answer

The exchange of gases between the alveoli and pulmonary capillaries.

Question 2

A patient with emphysema has decreased lung elasticity. Which physical factor is most directly affected, and what is the likely consequence?

Accepted Answer

Lung compliance; decreased ability to expand the lungs

Question 3

According to Boyle’s Law, what happens to intrapulmonary pressure when lung volume increases during inspiration?

Accepted Answer

Intrapulmonary pressure decreases.

Question 4

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

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 5

A patient’s arterial blood has a pH of 7.25 and elevated pCO2. Which mechanism best explains the relationship between CO2 and pH?

Accepted Answer

CO2 decreases plasma pH by forming carbonic acid.

Question 6

Which of the following is NOT a component of the respiratory zone?

Accepted Answer

Trachea

Question 7

During forced expiration, which lung volume is primarily measured?

Accepted Answer

Expiratory reserve volume

Question 8

Which law explains why oxygen and carbon dioxide diffuse independently across the respiratory membrane?

Accepted Answer

Dalton’s Law

Question 9

A patient with asthma experiences increased airway resistance. Which equation best describes the relationship between airflow ($$F$$), pressure difference ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 10

Which factor increases the affinity of hemoglobin for oxygen?

Accepted Answer

Decreased pCO2

Question 11

Which term describes normal, quiet breathing?

Accepted Answer

Eupnea

Question 12

Which of the following is a major means of CO2 transport in the blood?

Accepted Answer

As bicarbonate ion ($$HCO_3$$^-$$)

Question 13

A patient with cystic fibrosis has thick mucus in the airways. Which physical factor is most affected, and what is the likely result?

Accepted Answer

Airway resistance; decreased airflow

Question 14

Which structure is responsible for the initial filtering and humidification of inspired air?

Accepted Answer

Nose

Question 15

Which equation best represents the calculation of minute respiratory volume ($$MRV$$)?

Accepted Answer

$$MRV = TV 	imes RR$$

Question 16

Which disorder is characterized by destruction of alveolar walls and loss of lung elasticity?

Accepted Answer

Emphysema

Question 17

Which of the following best describes the Bohr effect?

Accepted Answer

Increased CO2 and decreased pH reduce hemoglobin’s affinity for O2.

Question 18

Which structure is NOT part of the conducting zone?

Accepted Answer

Alveolar sacs

Question 19

A patient’s vital capacity ($$VC) is $$measured as 4800 mL, inspiratory reserve volume ($$IRV) is 3000 mL$$, and tidal volume ($$TV) is 500 mL. $$What is the expiratory reserve volume ($$ERV$$)?

$$VC = IRV + TV + ERV$$

Accepted Answer

1300 mL

Question 20

Which respiratory center is primarily responsible for setting the basic rhythm of breathing?

Accepted Answer

Medullary respiratory centers

The Respiratory System: Structure, Function, and Regulation

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