Q: Which equation correctly represents the calculation for alveolar ventilation rate (AVR)?

$$AVR = frequency \times (TV - dead\ space)$$

Q: A patient has a tidal volume (TV) of 500 mL, a respiratory rate of 12 breaths/min, and a dead space of 150 mL. What is their alveolar ventilation rate (AVR)?

$$AVR = 12 \times (500 - 150) = 4,200\ mL/min$$

Question 1

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

Accepted Answer

Alveoli

Question 2

During inspiration, which muscle is primarily responsible for increasing the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 3

Which law explains the inverse relationship between the pressure and volume of a gas in the lungs?

Accepted Answer

Boyle’s Law

Question 4

A patient with a restrictive pulmonary disease would most likely show which of the following changes in lung volumes?

Accepted Answer

Decreased vital capacity (VC)

Question 5

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

Accepted Answer

Reduces surface tension to prevent alveolar collapse

Question 6

If the intrapleural pressure becomes equal to the intrapulmonary pressure, what is the most likely consequence?

Accepted Answer

Lung collapse

Question 7

Which equation correctly represents the calculation for alveolar ventilation rate (AVR)?

Accepted Answer

$$AVR = frequency 	imes (TV - dead\ space)$$

Question 8

A person is experiencing an asthma attack. Which of the following best explains the physiological change occurring in their airways?

Accepted Answer

Increased airway resistance due to bronchoconstriction

Question 9

Which of the following is a direct result of the Bohr effect in systemic capillaries?

Accepted Answer

Increased oxygen unloading to tissues

Question 10

Which of the following best describes the Haldane effect?

Accepted Answer

The lower the PO2 and hemoglobin saturation, the more CO2 can be carried in the blood

Question 11

Which of the following is NOT a function of the nasal conchae?

Accepted Answer

Facilitating gas exchange

Question 12

A patient has a tidal volume (TV) of 500 mL, a respiratory rate of 12 breaths/min, and a dead space of 150 mL. What is their alveolar ventilation rate (AVR)?

Accepted Answer

$$AVR = 12 	imes (500 - 150) = 4,200\ mL/min$$

Question 13

Which of the following changes would shift the oxygen-hemoglobin dissociation curve to the right, enhancing oxygen unloading at the tissues?

Accepted Answer

Increased H+ concentration (decreased pH)

Question 14

Which structure prevents food from entering the lower respiratory tract during swallowing?

Accepted Answer

Epiglottis

Question 15

Which of the following best describes the effect of increased airway resistance on pulmonary ventilation?

Accepted Answer

It decreases the amount of gas flowing into and out of the alveoli

Question 16

Which of the following equations correctly represents Boyle’s Law as it applies to pulmonary ventilation?

Accepted Answer

$$P = 1/V$$

Question 17

Which of the following is the correct sequence of airflow during inspiration?

Accepted Answer

Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 18

Which of the following is a function of the pleurae?

Accepted Answer

Reduce friction between lung and thoracic wall

Question 19

Which of the following best explains why carbon monoxide poisoning is so dangerous?

Accepted Answer

It binds to hemoglobin with a much higher affinity than oxygen

Question 20

Which of the following is the main factor that determines the direction of gas movement across the respiratory membrane?

Accepted Answer

Partial pressure gradients of the gases

The Respiratory System: Structure, Function, and Physiology

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