Question

"It was not until 18th century when they did a comprehensive work on properties of gases,
their exchange and respiration that we came to know something about how the process of
gaseous exchange goes on, in our body"

Answer 1

Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.