Question 1

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

Accepted Answer

To provide an extensive surface area for gas exchange between air and circulating blood

Question 2

Which structure is responsible for preventing food and liquids from entering the respiratory tract during swallowing?

Accepted Answer

Epiglottis

Question 3

A patient with pneumonia has fluid accumulation in the alveoli. Which of the following best explains why this impairs gas exchange?

Accepted Answer

Fluid increases the distance for diffusion across the blood air barrier

Question 4

Which equation correctly represents Boyle’s Law as it applies to pulmonary ventilation?

Accepted Answer

$$P = 1/V$$

Question 5

During forced exhalation, which muscles are primarily responsible for depressing the ribs?

Accepted Answer

Internal intercostal muscles and transversus thoracis

Question 6

A premature infant is experiencing respiratory distress syndrome. What is the most likely cause?

Accepted Answer

Inadequate surfactant production

Question 7

Which of the following is a correct calculation for alveolar ventilation ($$VA) if $$the respiratory rate is 12 breaths/min, tidal volume ($$VT) is 500 mL$$, and anatomic dead space ($$VD) is 150 mL$$?

Accepted Answer

$$VA = 12 	imes (500 - 150)$$

Question 8

Which of the following changes would shift the oxygen-hemoglobin saturation curve to the right, facilitating oxygen release to tissues?

Accepted Answer

Increased temperature

Question 9

Which of the following best describes the Bohr effect?

Accepted Answer

The effect of pH on hemoglobin saturation

Question 10

A patient is exposed to carbon monoxide (CO). Why is this dangerous?

Accepted Answer

CO binds to hemoglobin more strongly than O2, preventing oxygen transport

Question 11

Which of the following is the main way carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ions ($$HCO_3$$^-$$) in plasma

Question 12

Which of the following would most likely result in a collapsed lung (atelectasis)?

Accepted Answer

Air entering the pleural cavity (pneumothorax)

Question 13

Which of the following is a function of the nasal conchae and meatuses?

Accepted Answer

To trap particles, warm, and humidify incoming air

Question 14

Which of the following best describes the difference between external and internal respiration?

Accepted Answer

External respiration is gas exchange between blood and alveolar air; internal respiration is gas exchange between blood and tissues

Question 15

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

Accepted Answer

Excessive stimulation of smooth muscle causes severe bronchoconstriction

Question 16

Which of the following is true regarding the control of respiration by the brainstem?

Accepted Answer

The ventral respiratory group (VRG) is active only during forced breathing

Question 17

Which of the following would most likely increase the respiratory rate via chemoreceptor stimulation?

Accepted Answer

Increased arterial PCO2 (hypercapnia)

Question 18

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

Accepted Answer

$$VC = ERV + VT + IRV$$

Question 19

Which of the following is a direct effect of sympathetic activation on the bronchioles?

Accepted Answer

Bronchodilation

Question 20

Which of the following age-related changes in the respiratory system is most likely to decrease vital capacity?

Accepted Answer

Deterioration of elastic tissue

The Respiratory System: Structure, Function, and Physiology

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