Question

how are the lungs designed in human being to maximise the area for exchange of gases​

Answer 1

Answer:

Lungs contain millions of alveoli which provide a surface for the exchange of gases. These alveoli can expand to a very great extent.

An extensive network of blood vessels is present in the wall of the alveoli.

When we breathe in. we lift our ribs and flatten the diaphragm, the chest cavity becomed spacious, hence more air is sucked in.

Hope it helps

Answer 2

• 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.

• The walls of the alveoli actually share a membrane with the capillaries in which oxygen and carbon dioxide move freely between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart. At the same time, the carbon dioxide molecules in the alveoli are blown out of the body with the next exhalation.