Q: Which of the following formulas correctly calculates alveolar ventilation, considering anatomical dead space?

$$Alveolar\ ventilation = (VT - Dead\ space) \times RR$$

Q: A patient has a forced vital capacity (FVC) of 4000 mL and can exhale 3200 mL in the first second. What is their FEV1 percentage, and what does this indicate?

FEV1 = $$\frac{3200}{4000} \times 100 = 80\%$$, which is normal.

Question 1

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

Accepted Answer

It decreases the surface tension, increasing lung compliance and making inspiration easier.

Question 2

A patient with a restrictive pulmonary disease is likely to have which of the following changes in lung volumes?

Accepted Answer

Decreased total lung capacity (TLC) and decreased vital capacity (VC)

Question 3

During inspiration, which of the following is true regarding intra-alveolar pressure ($$P_{alv}) $$and atmospheric pressure ($$P_{atm}$$)?

Accepted Answer

$$P_{alv} is $$less than $$P_{atm}$$

Question 4

Which equation correctly represents the relationship between pressure and volume during pulmonary ventilation (Boyle's Law)?

Accepted Answer

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

Question 5

Which of the following structures is NOT part of the conducting zone of the respiratory tract?

Accepted Answer

Alveolar sacs

Question 6

A person has a tidal volume ($$VT) of 500 mL $$and a respiratory rate ($$RR) of 12 $$breaths/min. What is their minute ventilation?

Accepted Answer

$$6000 mL/$$min

Question 7

Which of the following best explains why intrapleural pressure ($$P_{ip}) is $$always negative under normal conditions?

Accepted Answer

The elasticity of the lungs and chest wall pull in opposite directions, creating a sub-atmospheric pressure.

Question 8

Which of the following would most likely occur if the smooth muscle of the bronchioles contracts?

Accepted Answer

Airway resistance increases and airflow decreases.

Question 9

Which of the following formulas correctly calculates alveolar ventilation, considering anatomical dead space?

Accepted Answer

$$Alveolar\ ventilation = (VT - Dead\ space) 	imes RR$$

Question 10

A patient has a forced vital capacity (FVC) of 4000 mL and can exhale 3200 mL in the first second. What is their FEV1 percentage, and what does this indicate?

Accepted Answer

FEV1 = $$\frac{3200}{4000} 	imes 100 = 80\%$$, which is normal.

Question 11

Which of the following best describes the role of the diaphragm during inspiration?

Accepted Answer

It contracts and flattens, increasing thoracic volume.

Question 12

Which of the following is a function of the conducting zone of the respiratory tract?

Accepted Answer

Humidification and warming of inspired air

Question 13

If a person’s inspiratory reserve volume (IRV) is 3000 mL, tidal volume (VT) is 500 mL, and expiratory reserve volume (ERV) is 1000 mL, what is their vital capacity (VC)?

Accepted Answer

$$VC = VT + IRV + ERV = 500 + 3000 + 1000 = 4500 mL$$

Question 14

Which of the following would most likely decrease lung compliance?

Accepted Answer

Scarring of lung tissue (fibrosis)

Question 15

Which of the following best describes the effect of histamine on the bronchioles?

Accepted Answer

It causes bronchoconstriction and increases mucus secretion.

Question 16

Which of the following is the correct formula for transpulmonary pressure?

Accepted Answer

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

Question 17

A person inhales maximally and then exhales maximally. The volume of air exhaled is called:

Accepted Answer

Vital capacity

Question 18

Which of the following is true regarding the anatomical dead space?

Accepted Answer

It is the volume of air in the conducting zone that does not participate in gas exchange.

Question 19

Which of the following would most likely occur in a patient with an obstructive pulmonary disease such as asthma?

Accepted Answer

Increased airway resistance and decreased FEV1

Pulmonary Ventilation and the Respiratory System: Structure, Function, and Clinical Significance

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