The exchange of respiratory gases in the lungs occur in-

Correct option is B

The correct answer is (b) Alveoli.
· The alveoli are tiny air sacs in the lungs where the exchange of respiratory gases (oxygen and carbon dioxide) occurs.
· Oxygen from the inhaled air passes through the walls of the alveoli into the blood in the capillaries, while carbon dioxide from the blood is released into the alveoli to be exhaled.
· The large surface area of the alveoli and their thin walls make them highly efficient for gas exchange.
· There are approximately 300 million alveoli in a healthy adult lung, which helps in maximizing the gas exchange process.
Additional Knowledge:
· Trachea - Also known as the windpipe, the trachea serves as a passage for air to move from the mouth and nose to the bronchi, but gas exchange does not occur here.
· Bronchi - The bronchi are the large tubes that branch from the trachea into each lung, directing air into the bronchioles, but they do not participate directly in gas exchange.
· Bronchiole - These are smaller air passages that lead to the alveoli. They help direct air but are not the site of gas exchange.