Explore the essential functions and anatomy of the respiratory system with these 20 MCQ on Respiratory System . Test your knowledge on topics such as gas exchange, respiratory diseases, and the role of key structures like the lungs and diaphragm. Perfect for students and anyone interested in understanding how our bodies breathe and maintain vital oxygen levels!
MCQ on Respiratory System
1. What is the primary function of the respiratory system?
A) Digestion of food
B) Exchange of gases
C) Circulation of blood
D) Regulation of body temperature
Answer: B
2. Which structure is responsible for the exchange of oxygen and carbon dioxide in the lungs?
A) Bronchi
B) Alveoli
C) Trachea
D) Larynx
Answer: B
3. The process by which oxygen is transported in the blood is primarily through:
A) Plasma
B) White blood cells
C) Hemoglobin in red blood cells
D) Platelets
Answer: C
4. Which part of the brain regulates the respiratory rate?
A) Cerebrum
B) Cerebellum
C) Medulla oblongata
D) Thalamus
Answer: C
5. What is the main muscle involved in breathing?
A) Intercostal muscles
B) Diaphragm
C) Abdominal muscles
D) Pectoral muscles
Answer: B
6. Which of the following conditions is characterized by inflammation of the airways?
A) Asthma
B) Emphysema
C) Pneumonia
D) Tuberculosis
Answer: A
7. What gas do humans primarily exhale during respiration?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
Answer: C
8. Which structure prevents food from entering the trachea during swallowing?
A) Epiglottis
B) Uvula
C) Larynx
D) Pharynx
Answer: A
9. The volume of air that can be forcibly exhaled after a normal expiration is known as:
A) Tidal volume
B) Vital capacity
C) Expiratory reserve volume
D) Inspiratory reserve volume
Answer: C
10. What is the primary cause of emphysema?
A) Viral infection
B) Smoking
C) Allergies
D) Pollution
Answer: B
11. Which type of respiration occurs in the presence of oxygen?
A) Anaerobic respiration
B) Aerobic respiration
C) Fermentation
D) Cellular respiration
Answer: B
12. In which part of the respiratory system does gas exchange primarily occur?
A) Bronchioles
B) Alveoli
C) Trachea
D) Larynx
Answer: B
13. Which condition is characterized by fluid accumulation in the lungs?
A) Asthma
B) Pneumonia
C) Bronchitis
D) COPD
Answer: B
14. How is most carbon dioxide transported in the blood?
A) As carbonic acid
B) Bound to hemoglobin
C) Dissolved in plasma
D) All of the above
Answer: D
15. What term describes the total amount of air that can be inhaled and exhaled in one breath?
A) Vital capacity
B) Tidal volume
C) Total lung capacity
D) Residual volume
Answer: B
16. Which membrane surrounds and protects the lungs?
A) Pericardium
B) Pleura
C) Peritoneum
D) Endocardium
Answer: B
17. What happens to breathing rate during exercise?
A) It decreases
B) It remains constant
C) It increases
D) It stops temporarily
Answer: C
18. Which respiratory condition is often caused by long-term exposure to irritants like smoke or dust?
A) Asthma
B) Chronic bronchitis
C) Pulmonary fibrosis
D) All of the above
Answer:D
19. What type of cells line the alveoli and facilitate gas exchange?
A) Cuboidal epithelial cells
B) Squamous epithelial cells
C) Columnar epithelial cells
D) Transitional epithelial cells
Answer: B
20. Which respiratory structure connects the throat to the lungs?
A) Larynx
B) Trachea
C) Pharynx
D) Bronchi
Answer: B
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