Human Respiratory System -Multiple Choice Questions Quiz

Interactive MCQs on “Human Respiratory System”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1:What is the primary function of the respiratory system?

(A) Pumping blood
(B) Gas exchange
(C) Digesting food
(D) Sending signals to the brain

Question 2:Which organ is the main site of gas exchange in the human body?

(A) Trachea
(B) Bronchi
(C) Lungs
(D) Diaphragm

Question 3: What is the function of the diaphragm in breathing?

(A) Helps move air in and out of the lungs
(B) Filters dust and microbes
(C) Transports oxygen in blood
(D) Produces mucus

Question 4:Which part of the respiratory system connects the mouth and nose to the lungs?

(A) Alveoli
(B) Trachea
(C) Diaphragm
(D) Esophagus

Question 5:What happens in the alveoli?

(A) Air is warmed and moistened
(B) Sound is produced
(C) Gas exchange occurs
(D) Mucus is secreted

Question 6:Which gas is exhaled as a waste product of respiration?

(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon dioxide

Question 7:What role do the bronchi play in the respiratory system?

(A) Exchange gases
(B) Carry air into the lungs
(C) Pump blood
(D) Absorb nutrients

Question 8:What structure prevents food from entering the windpipe during swallowing?

(A) Epiglottis
(B) Alveoli
(C) Bronchi
(D) Diaphragm

Question 9:How does smoking affect the respiratory system?

(A) Improves oxygen absorption
(B) Strengthens the lungs
(C) Causes lung damage
(D) Helps filter air

Question 10:Which organ helps control breathing by detecting oxygen and carbon dioxide levels?

(A) Lungs
(B) Heart
(C) Diaphragm
(D) Brainstem