Question 1

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

Accepted Answer

Epiglottis

Question 2

What is the primary function of the paranasal sinuses in the respiratory system?

Accepted Answer

To lighten the skull, secrete mucus, and help warm and moisten air

Question 3

During inspiration, which muscles contract to increase thoracic cavity volume?

Accepted Answer

External intercostals and diaphragm

Question 4

According to Boyle’s law, what happens to the pressure of a gas if the volume of its container is decreased, assuming the amount of gas remains constant?

Accepted Answer

Pressure increases

Question 5

Which equation best represents Boyle’s law?

Accepted Answer

$$P 	imes V = k$$

Question 6

A patient with chronic bronchitis is likely to experience which of the following symptoms?

Accepted Answer

Frequent pulmonary infections and productive cough

Question 7

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

Accepted Answer

Reduces surface tension to prevent alveolar collapse

Question 8

Why is the right main bronchus more likely to be obstructed by a foreign object than the left?

Accepted Answer

It is shorter, wider, and more vertical

Question 9

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

Accepted Answer

Main site of gas exchange

Question 10

During external respiration, which direction does oxygen move?

Accepted Answer

From alveoli into blood

Question 11

Which structure is part of the conducting zone but NOT the respiratory zone?

Accepted Answer

Terminal bronchioles

Question 12

What is the main force that drives air into the lungs during inspiration?

Accepted Answer

A drop in intrapulmonary pressure below atmospheric pressure

Question 13

Which of the following would most likely decrease lung compliance?

Accepted Answer

Scar tissue formation in the lungs

Question 14

Which of the following is TRUE regarding the pleurae?

Accepted Answer

The parietal pleura lines the thoracic wall, while the visceral pleura covers the lung surface

Question 15

Which of the following best explains why gas exchange is efficient in the alveoli?

Accepted Answer

The respiratory membrane is thin and has a large surface area

Question 16

A patient with emphysema is likely to have which of the following changes in their lungs?

Accepted Answer

Destruction of alveolar walls and loss of lung elasticity

Question 17

Which of the following is a major function of the pharynx?

Accepted Answer

Passageway for air and food

Question 18

Which of the following best describes the relationship between pressure and volume in the lungs during breathing?

Accepted Answer

As lung volume increases, pressure decreases

Question 19

Which of the following is a consequence of fluid accumulation in the pleural cavity?

Accepted Answer

Lung collapse due to loss of negative intrapleural pressure

Question 20

Which neural mechanism is primarily responsible for generating the basic rhythm of breathing?

Accepted Answer

Ventral respiratory group in the medulla

The Respiratory System: Structure, Function, and Physiology

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