Question 1

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

Accepted Answer

Supply oxygen, remove carbon dioxide, and regulate blood pH

Question 2

Gas exchange in the respiratory system occurs between which two structures?

Accepted Answer

Alveoli and capillaries

Question 3

Cells require oxygen ($$O_2) $$for metabolism and must remove which waste product to function properly?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 4

Which statement about the exchange of $$O_2$$ and $$CO_2 in $$the blood is correct?

Accepted Answer

It occurs in the alveoli.

Question 5

The conducting passageways of the respiratory system serve to:

Accepted Answer

Warm, moisten, and filter incoming air

Question 6

Which structure divides the nasal cavity into two sides?

Accepted Answer

Nasal septum

Question 7

What is the primary function of olfactory receptors located in the upper part of the nasal cavity?

Accepted Answer

Sensing odors

Question 8

Which of the following is NOT a function of the respiratory mucosa?

Accepted Answer

Producing red blood cells

Question 9

A cleft palate is best described as:

Accepted Answer

A congenital defect where the palate fails to fuse

Question 10

Rhinitis and sinusitis are both conditions affecting the respiratory system. Which statement is correct?

Accepted Answer

Rhinitis is inflammation of the nasal mucosa; sinusitis is inflammation of the sinuses.

Question 11

The epiglottis is called the 'guardian of the airway' because:

Accepted Answer

It prevents food and liquids from entering the trachea during swallowing.

Question 12

What is the function of cilia in the trachea, and how does smoking affect them?

Accepted Answer

Cilia move mucus upward; smoking paralyzes and destroys them.

Question 13

The trachea splits into the right and left:

Accepted Answer

Main (primary) bronchi

Question 14

Which statement about the lungs is correct?

Accepted Answer

The left lung has two lobes; the right lung has three lobes.

Question 15

Gas exchange in the lungs occurs in which structure?

Accepted Answer

Alveoli

Question 16

Which sequence correctly describes the pathway of air from the trachea to the site of gas exchange?

Accepted Answer

Trachea → Main bronchi → Bronchioles → Alveoli

Question 17

Which of the following is NOT one of the four distinct events of respiration?

Accepted Answer

Digestive absorption

Question 18

During inspiration, which physiological event occurs first?

Accepted Answer

Diaphragm and intercostal muscles contract

Question 19

Which of the following is a nonrespiratory air movement?

Accepted Answer

Coughing

Question 20

Chronic bronchitis and emphysema are both caused by which two main factors?

Accepted Answer

Smoking and long-term exposure to irritants

Respiratory System Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions