Q: Which equation best represents the process of cellular respiration that the respiratory system supports?

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

Question 1

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

Accepted Answer

To supply the body with O$$_2$$ for cellular respiration and remove CO$$_2$$, a waste product

Question 2

During which process does O$$_2$$ and CO$$_2$$ exchange occur between the lungs and blood?

Accepted Answer

External respiration

Question 3

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

Accepted Answer

Alveoli

Question 4

What is the correct order of airflow from the trachea to the alveolus?

Accepted Answer

Trachea → Main bronchi → Lobar bronchi → Segmental bronchi → Bronchioles → Terminal bronchioles → Respiratory bronchioles → Alveolar ducts → Alveoli

Question 5

Which of the following statements about type I and type II alveolar cells is correct?

Accepted Answer

Type II cells secrete surfactant and antimicrobial proteins; type I cells form the thin respiratory membrane for gas exchange

Question 6

Which anatomical feature of the nasal cavity increases mucosal area and enhances air turbulence?

Accepted Answer

Nasal conchae

Question 7

What is the role of the glottis during Valsalva's maneuver?

Accepted Answer

It closes to prevent exhalation and increase intra-abdominal pressure

Question 8

Which layer of the tracheal wall contains ciliated pseudostratified epithelium with goblet cells?

Accepted Answer

Mucosa

Question 9

A patient inhales a foreign object. Which bronchus is it most likely to enter and why?

Accepted Answer

Right main bronchus, because it is wider, shorter, and more vertical

Question 10

Which equation best represents the process of cellular respiration that the respiratory system supports?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 11

Which of the following is TRUE regarding the blood supply to the lungs?

Accepted Answer

Pulmonary arteries deliver deoxygenated blood to the lungs for oxygenation

Question 12

Which structure is responsible for filtering coarse particles from inspired air in the nasal cavity?

Accepted Answer

Vibrissae

Question 13

Which region of the pharynx serves as a passageway for both food and air and is lined with stratified squamous epithelium?

Accepted Answer

Oropharynx

Question 14

What is the main function of alveolar pores?

Accepted Answer

To connect adjacent alveoli and equalize air pressure throughout the lung

Question 15

Which of the following best explains why the respiratory membrane is so thin (about 0.5 μm)?

Accepted Answer

To allow for rapid diffusion of gases between alveoli and capillaries

Question 16

Which process is directly responsible for the movement of O$$_2$$ from alveoli into pulmonary capillaries?

Accepted Answer

Simple diffusion

Question 17

Which of the following changes occurs as airways progress from bronchi to bronchioles?

Accepted Answer

Cartilage rings become irregular plates and are replaced by elastic fibers

Question 18

A patient with damage to the cilia in the respiratory mucosa would most likely experience which of the following?

Accepted Answer

Impaired movement of contaminated mucus to the throat

Question 19

Which of the following is a function of the nose in respiration?

Accepted Answer

Provides an airway, moistens and warms air, filters and cleans inspired air, serves as a resonating chamber for speech, and houses olfactory receptors

Question 20

Which of the following best describes the role of pulmonary capillary endothelium in blood pressure regulation?

Accepted Answer

It contains enzymes such as angiotensin-converting enzyme that activate blood pressure hormones

The Respiratory System: Structure, Function, and Processes

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