Question 1

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

Accepted Answer

To serve as the main site of gas exchange between air and blood

Question 2

During inspiration, which of the following events occurs to facilitate airflow into the lungs?

Accepted Answer

Intrapulmonary volume increases, causing intrapulmonary pressure to drop below atmospheric pressure

Question 3

Which equation correctly represents the conversion of carbon dioxide to bicarbonate in the blood?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow H_2CO_3 \rightarrow $$HCO_3^- + H$$^+$$

Question 4

A patient is hyperventilating. What is the most likely immediate effect on blood pH?

Accepted Answer

Blood pH increases due to decreased CO$$_2$$

Question 5

Which respiratory volume is defined as the amount of air exchanged during normal quiet breathing?

Accepted Answer

Tidal Volume (TV)

Question 6

If a person forcibly exhales after a normal breath, which volume is being measured?

Accepted Answer

Expiratory Reserve Volume (ERV)

Question 7

Which of the following best explains why the left lung has fewer lobes than the right lung?

Accepted Answer

The left lung is smaller due to the presence of the heart

Question 8

Which of the following is the correct sequence of events during expiration?

Accepted Answer

Diaphragm relaxes, intrapulmonary volume decreases, intrapulmonary pressure increases, air flows out

Question 9

Which of the following is the most important chemical factor regulating the rate and depth of breathing?

Accepted Answer

Carbon dioxide concentration in the blood

Question 10

A person breathes into a paper bag during hyperventilation. What is the physiological rationale for this intervention?

Accepted Answer

To restore carbon dioxide levels and prevent respiratory alkalosis

Question 11

Which of the following best describes the relationship between lung volume and pressure during inspiration?

Accepted Answer

As lung volume increases, intrapulmonary pressure decreases

Question 12

Which structure is the primary site of gas exchange in the lungs?

Accepted Answer

Alveoli

Question 13

Which of the following is NOT a factor that can affect respiratory capacity?

Accepted Answer

Blood glucose level

Question 14

Which of the following statements about the transport of oxygen in the blood is correct?

Accepted Answer

Most oxygen is carried by hemoglobin in red blood cells

Question 15

Which of the following best explains the effect of sympathetic nervous system activation on the respiratory system?

Accepted Answer

Dilation of bronchioles

Question 16

Which of the following volumes cannot be voluntarily exhaled from the lungs?

Accepted Answer

Residual Volume (RV)

Question 17

Which formula best represents the calculation of total lung capacity (TLC)?

Accepted Answer

$$TLC = TV + IRV + ERV + RV$$

Question 18

Which of the following is a direct result of increased CO$$_2$$ levels in the blood?

Accepted Answer

Increased rate and depth of breathing

Question 19

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

Accepted Answer

Decreases surface tension to facilitate gas exchange

Question 20

Which of the following events occurs during external respiration?

Accepted Answer

Gas exchange between alveoli and blood

Anatomy & Physiology of the Respiratory System: Structure, Function, and Breathing Mechanics

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