Which organ system includes the lungs and is responsible for gas exchange?
A
Respiratory system
B
Circulatory system
C
Digestive system
D
Nervous system
Correct Answer: Option A — Respiratory system
Explanation:
The respiratory system, including the lungs, trachea, and bronchi, facilitates the exchange of oxygen and carbon dioxide between the body and the atmosphere, supplying oxygen needed for cellular respiration and removing waste gas.