Q: What is the partial pressure of oxygen in the alveoli during alveolar gas exchange?

$$\text{PO}_2 = 104\ \text{mm Hg}$$

Q: Which of the following is a correct equation for the conversion of carbon dioxide to bicarbonate in erythrocytes?

$$\text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{CO}_3 \rightarrow \text{HCO}_3^- + \text{H}^+$$

Q: Which factor increases the release of oxygen from hemoglobin in systemic tissues?

Increased $$\text{H}^+$$ concentration (Bohr effect)

Question 1

Which of the following best describes the structural difference between the conducting zone and the respiratory zone of the respiratory tract?

Accepted Answer

The conducting zone consists of passageways that transport air but do not participate in gas exchange, while the respiratory zone includes structures where gas exchange occurs.

Question 2

Which epithelial lining is found in the alveoli, and why is it functionally important?

Accepted Answer

Simple squamous epithelium; it facilitates rapid gas diffusion.

Question 3

During quiet inspiration, which changes occur in the thoracic cavity and lung pressures?

Accepted Answer

The diaphragm contracts, thoracic cavity volume increases, and intrapulmonary pressure decreases below atmospheric pressure.

Question 4

According to Boyle’s law, what happens to the pressure in the lungs when the volume increases?

Accepted Answer

Pressure decreases as volume increases.

Question 5

Which formula correctly represents the calculation of vital capacity?

Accepted Answer

Vital capacity = Tidal volume + Inspiratory reserve volume + Expiratory reserve volume

Question 6

A patient with pneumonia has a thickened respiratory membrane. What is the most likely consequence?

Accepted Answer

Decreased alveolar gas exchange due to increased diffusion distance.

Question 7

Which muscle is primarily responsible for increasing the vertical dimension of the thoracic cavity during inspiration?

Accepted Answer

Diaphragm

Question 8

What is the partial pressure of oxygen in the alveoli during alveolar gas exchange?

Accepted Answer

$$	ext{PO}_2 = 104\ 	ext{mm Hg}$$

Question 9

Which of the following best explains the chloride shift in erythrocytes during systemic gas exchange?

Accepted Answer

Chloride ions move into erythrocytes as bicarbonate moves out to maintain electrical neutrality.

Question 10

Which of the following is a correct equation for the conversion of carbon dioxide to bicarbonate in erythrocytes?

Accepted Answer

$$	ext{CO}_2 + 	ext{H}_2	ext{O} ightarrow 	ext{H}_2	ext{CO}_3 ightarrow 	ext{HCO}_3^- + 	ext{H}^+$$

Question 11

Which factor increases the release of oxygen from hemoglobin in systemic tissues?

Accepted Answer

Increased $$	ext{H}^+$$ concentration (Bohr effect)

Question 12

What is the effect of increased $$	ext{CO}_2 in $$the air within a bronchiole on the diameter of the bronchiole?

Accepted Answer

Bronchiole dilates

Question 13

Which of the following is the correct formula for total lung capacity?

Accepted Answer

$$	ext{Total lung capacity} = 	ext{TV} + 	ext{IRV} + 	ext{ERV} + 	ext{RV}$$

Question 14

Which process is directly responsible for the movement of oxygen from alveoli into the blood?

Accepted Answer

Alveolar gas exchange

Question 15

A patient with anemia is likely to experience which of the following consequences?

Accepted Answer

Decreased gas transport due to low hemoglobin concentration

Question 16

Which of the following statements about the respiratory membrane is correct?

Accepted Answer

It is composed of alveolar epithelium, capillary endothelium, and their fused basement membranes.

Question 17

Which of the following best describes the effect of a pulmonary embolism on gas exchange?

Accepted Answer

It decreases gas exchange by blocking blood flow to lung capillaries.

Question 18

Which of the following is true regarding the transport of carbon dioxide in the blood?

Accepted Answer

Most carbon dioxide is converted to bicarbonate and transported in plasma.

Question 19

Which of the following is a consequence of loss of respiratory membrane surface area, as seen in emphysema?

Accepted Answer

Decreased alveolar gas exchange

Comprehensive Study Notes: The Respiratory System (Anatomy & Physiology)

Guida di studio - Domande di pratica

Study guide - Flashcard