The respiratory system is the biological system that enables breathing in animals, including humans. It consists of the organs and tissues involved in the exchange of oxygen and carbon dioxide between the body and the environment. The primary function of the respiratory system is to supply the body with oxygen and remove carbon dioxide, which is a waste product of metabolism. The main organs of the respiratory system include the lungs, bronchi, trachea, and diaphragm. The process of breathing involves inhaling oxygen-rich air, transporting it to the lungs, exchanging oxygen and carbon dioxide in the lungs, and exhaling carbon dioxide-rich air. The respiratory system also plays a role in regulating the body’s pH and temperature. Respiratory diseases can affect the lungs and airways, and they can range from mild to severe, with some being life-threatening.

1. What is the main function of the respiratory system?
a) To circulate blood throughout the body
b) To remove waste products from the body
c) To provide oxygen to the body and remove carbon dioxide
d) To digest food and absorb nutrients

2. What are the main organs of the respiratory system?
a) The lungs, bronchi, and trachea
b) The heart, liver, and spleen
c) The kidneys, bladder, and urethra
d) The stomach, intestines, and pancreas

3. What is the name of the muscle that aids in breathing by contracting and relaxing?
a) The diaphragm
b) The heart muscle
c) The biceps muscle
d) The quadriceps muscle

4. Which part of the respiratory system helps to warm and moisten air before it enters the lungs?
a) The bronchi
b) The trachea
c) The nose and nasal cavity
d) The alveoli

5. What is the medical term for difficulty breathing?
a) Asthma
b) Emphysema
c) Bronchitis
d) Dyspnea

6. Which of the following is a condition where the walls of the alveoli break down, reducing the surface area available for gas exchange?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

7. Which of the following structures in the respiratory system is also known as the windpipe?
a) The bronchi
b) The trachea
c) The alveoli
d) The pharynx

8. Which of the following is a condition characterized by inflammation and narrowing of the airways, leading to wheezing, coughing, and difficulty breathing?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

9. What is the name of the small air sacs in the lungs where gas exchange occurs?
a) The bronchi
b) The trachea
c) The alveoli
d) The pharynx

10. Which of the following is a highly contagious respiratory infection caused by a virus?
a) Tuberculosis
b) Pneumonia
c) Influenza
d) Bronchitis

11. Which of the following is a procedure that measures lung function?
a) Bronchoscopy
b) X-ray
c) MRI
d) Spirometry

12. What is the name of the condition where the air sacs in the lungs become inflamed and filled with fluid, leading to difficulty breathing?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

13. Which of the following is a condition where the bronchial tubes become inflamed, leading to coughing and production of mucus?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

14. Which of the following is a condition where the lungs become damaged and lose their elasticity, making it difficult to breathe?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

15. What is the name of the condition where the airways in the lungs become narrowed, leading to shortness of breath and wheezing?
a) Asthma
b) Emphysema
c) Bronchitis
d) Pneumonia

Answer Key

MCQ	Answer
1	c
2	a
3	a
4	c
5	d
6	b
7	b
8	a
9	c
10	c
11	d
12	d
13	c
14	b
15	a