Q: Calculate the alveolar ventilation rate (AVR) for a patient with a tidal volume (TV) of 600 ml, a respiratory rate (RR) of 10 breaths/min, and an anatomical dead space of 150 ml.

$$AVR = RR \times (TV - dead\ space) = 10 \times (600 - 150) = 4500\ ml/min$$

Question 1

Which of the following structures is the primary site of gas exchange in the human respiratory system?

Accepted Answer

Alveoli

Question 2

A patient with a genetic disorder has thick, sticky mucus that accumulates in the airways, leading to frequent respiratory infections. Which disease is most likely described?

Accepted Answer

Cystic Fibrosis

Question 3

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

Accepted Answer

$$P 	imes V = k$$

Question 4

During inspiration, which of the following occurs?

Accepted Answer

Thoracic cavity volume increases

Question 5

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

Accepted Answer

Reduces surface tension, preventing alveolar collapse

Question 6

A scuba diver experiences nitrogen narcosis at great depths. Which law explains why nitrogen dissolves more in the blood under high pressure?

Accepted Answer

Henry’s Law

Question 7

Calculate the alveolar ventilation rate (AVR) for a patient with a tidal volume (TV) of 600 ml, a respiratory rate (RR) of 10 breaths/min, and an anatomical dead space of 150 ml.

Accepted Answer

$$AVR = RR 	imes (TV - dead\ space) = 10 	imes (600 - 150) = 4500\ ml/min$$

Question 8

Which of the following would cause a rightward shift in the oxygen-hemoglobin dissociation curve?

Accepted Answer

Increased 2,3-BPG

Question 9

A patient is diagnosed with pneumonia. Which of the following best explains why gas exchange is impaired in this condition?

Accepted Answer

Fluid accumulation increases the thickness of the respiratory membrane

Question 10

Which of the following is the correct formula for calculating vital capacity (VC)?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 11

Which of the following is the main factor that stimulates increased ventilation during exercise?

Accepted Answer

Increased arterial CO2

Question 12

A patient with chronic bronchitis is likely to have which of the following symptoms?

Accepted Answer

Frequent productive cough

Question 13

Which of the following best describes the chloride shift in systemic capillaries?

Accepted Answer

Chloride ions move into the RBC as bicarbonate exits

Question 14

Which of the following is NOT a function of the conducting zone of the respiratory system?

Accepted Answer

Gas exchange

Question 15

A patient is exposed to carbon monoxide (CO). Why is this dangerous?

Accepted Answer

CO binds to hemoglobin with a much higher affinity than O2

Question 16

Which of the following would most likely decrease lung compliance?

Accepted Answer

Fibrosis (scarring) of lung tissue

Question 17

Which of the following best describes the Bohr effect?

Accepted Answer

Increased CO2 and H+ promote O2 unloading from hemoglobin

Question 18

Which of the following is the correct formula for calculating minute respiratory volume (MRV)?

Accepted Answer

$$MRV = TV 	imes RR$$

Question 19

Which of the following is a consequence of pleurisy with decreased pleural fluid?

Accepted Answer

Painful breathing due to increased friction

Question 20

A patient at high altitude develops acute mountain sickness (AMS). Which physiological response helps the body acclimate to the lower atmospheric PO2?

Accepted Answer

Increased red blood cell production

Chapter 22: The Respiratory System – Structure, Function, and Clinical Relevance

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