Q: Which of the following is the correct formula for calculating minute volume?

$$Minute\ Volume = Tidal\ Volume \times Respiratory\ Rate$$

Question 1

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

Accepted Answer

It decreases the surface tension, preventing alveolar collapse during expiration.

Question 2

A patient with a restrictive lung disease is most likely to have which of the following spirometry findings?

Accepted Answer

Decreased inspiratory capacity and decreased total lung capacity

Question 3

According to Boyle’s Law, what happens to the pressure inside the lungs when the volume of the thoracic cavity increases during inspiration?

Accepted Answer

Pressure decreases, causing air to flow into the lungs.

Question 4

Which of the following is the correct formula for calculating minute volume?

Accepted Answer

$$Minute\ Volume = Tidal\ Volume 	imes Respiratory\ Rate$$

Question 5

A patient is exposed to carbon monoxide (CO). Which of the following best explains why CO poisoning is so dangerous?

Accepted Answer

CO binds to hemoglobin with a much higher affinity than oxygen, preventing oxygen transport.

Question 6

Which of the following best describes the effect of hyperventilation on blood pH?

Accepted Answer

It decreases blood CO$$_2$$ and increases pH, causing respiratory alkalosis.

Question 7

Which of the following is a primary function of the nasal conchae?

Accepted Answer

To increase the surface area for warming, humidifying, and filtering inhaled air

Question 8

A patient with emphysema is likely to experience which of the following changes in gas exchange?

Accepted Answer

Decreased surface area for gas exchange, leading to hypoxemia and hypercapnia

Question 9

Which of the following best explains the Bohr effect?

Accepted Answer

Increased temperature and decreased pH decrease hemoglobin’s affinity for oxygen, promoting oxygen unloading in tissues.

Question 10

Which of the following is the correct sequence of airflow from the external environment to the alveoli?

Accepted Answer

Nares → Nasal cavity → Pharynx → Larynx → Trachea → Primary bronchi → Secondary bronchi → Tertiary bronchi → Bronchioles → Terminal bronchioles → Respiratory bronchioles → Alveolar ducts → Alveolar sacs

Question 11

A patient with a pulmonary embolism develops alveolar dead space. What does this mean?

Accepted Answer

The alveoli are ventilated but not perfused with blood.

Question 12

Which of the following equations correctly represents the reaction catalyzed by carbonic anhydrase in erythrocytes?

Accepted Answer

$$CO_2 + H_2O$$ \xrightleftharpoons[	ext{carbonic anhydrase}]{} H_2CO_3 \xrightleftharpoons{} $$HCO_3^- + H$$^+$$

Question 13

Which of the following best describes the role of the central chemoreceptors in the control of ventilation?

Accepted Answer

They detect changes in the hydrogen ion concentration and partial pressure of carbon dioxide in the cerebrospinal fluid.

Question 14

A patient with severe asthma is experiencing bronchoconstriction. Which of the following is a likely physiological effect?

Accepted Answer

Increased airway resistance and decreased airflow

Question 15

Which of the following is a function of the pleural fluid in the pleural cavity?

Accepted Answer

It lubricates the lungs, reducing friction during breathing.

Question 16

A patient with pneumonia has thickened respiratory membranes. What is the most likely effect on gas exchange?

Accepted Answer

Decreased rate of diffusion of gases across the membrane

Question 17

Which of the following best explains why the right primary bronchus is more likely to become obstructed by an inhaled object than the left?

Accepted Answer

The right primary bronchus is wider, shorter, and more vertical than the left.

Question 18

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

Accepted Answer

$$VC = TV + IRV + ERV$$

The Respiratory System: Structure, Function, and Clinical Correlates

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