Q: Calculate the total pulmonary ventilation for an adult with a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. Use the formula $$\text{Total Ventilation} = \text{Tidal Volume} \times \text{Respiratory Rate}.$$

$$500 \text{ mL} \times 12 = 6000 \text{ mL/min}$$

Question 1

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

Accepted Answer

They serve as the main site for gas exchange between air and blood.

Question 2

A patient with emphysema is found to have increased lung compliance. What does this mean regarding the physical properties of their lungs?

Accepted Answer

Their lungs expand easily but have reduced elastic recoil.

Question 3

According to Boyle's Law, what happens to the pressure of a gas if the volume of its container decreases, assuming temperature remains constant? Write the equation for Boyle's Law.

Accepted Answer

Pressure increases; $$P_1V_1 = P_2V_2$$

Question 4

During quiet breathing, which muscles are primarily responsible for inspiration?

Accepted Answer

Diaphragm and external intercostal muscles

Question 5

A premature baby is experiencing respiratory distress due to a lack of surfactant. What is the physiological consequence of this deficiency?

Accepted Answer

Increased work of breathing due to higher surface tension in alveoli

Question 6

Which of the following factors most significantly affects airway resistance in the respiratory system according to Poiseuille's Law?

Accepted Answer

Radius of the airway

Question 7

Calculate the total pulmonary ventilation for an adult with a tidal volume of 500 mL and a respiratory rate of 12 breaths per minute. Use the formula $$	ext{Total Ventilation} = 	ext{Tidal Volume} 	imes 	ext{Respiratory Rate}.$$

Accepted Answer

$$500 	ext{ mL} 	imes 12 = 6000 	ext{ mL/min}$$

Question 8

Which of the following best explains why puncturing the pleural membrane causes the lung to collapse?

Accepted Answer

It equalizes the intrapleural pressure with atmospheric pressure, eliminating the negative pressure that keeps the lung expanded.

Question 9

During forced expiration, which muscles are actively contracting?

Accepted Answer

Internal intercostal muscles and abdominal muscles

Question 10

According to the law of LaPlace, which alveolus will have a higher internal pressure if both have equal surface tension: a large alveolus or a small alveolus? Use the equation $$P = 2T/r.$$

Accepted Answer

The small alveolus

Question 11

Which of the following changes would most likely cause bronchioles to constrict?

Accepted Answer

Increased histamine release

Question 12

What is the main physiological property responsible for passive expiration in the lungs?

Accepted Answer

Elastic recoil of lung tissue

Question 13

Which of the following best describes the relationship between flow ($$F$$), pressure ($$P$$), and resistance ($$R) in $$the respiratory system? State the equation.

Accepted Answer

$$F = P / R$$

Question 14

A patient is hyperventilating. What changes would you expect in their alveolar partial pressures of O$$_2$$ ($$P_{O_2$}) $$and CO$$_2$$ ($$P_{CO_2$}$$)?

Accepted Answer

$$P_{O_2$}$$ increases, $$P_{CO_2$}$$ decreases

Question 15

Which of the following is a correct statement about the pleural fluid?

Accepted Answer

It creates surface tension that helps keep the lungs adhered to the thoracic wall.

Question 16

Which of the following lung volumes is defined as the amount of air remaining in the lungs after a maximal exhalation?

Accepted Answer

Residual volume

Question 17

During normal breathing, at what point in the respiratory cycle is alveolar pressure lowest?

Accepted Answer

During inspiration, just before air flows in

Question 18

Which of the following diseases is classified as an obstructive lung disease?

Accepted Answer

Emphysema

Question 19

Auscultation is used in clinical practice to assess pulmonary function. What does auscultation involve?

Accepted Answer

Listening to breath sounds using a stethoscope

Chapter 17 Respiratory system

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