Question

With the help of a labelled diagram, describe the respiratory system in humans.

Answer 1

In humans, lungs are the organs of respiration, which are present inside the chest and protected by the rib cage. The ribs support the lungs and help in pumping air in and out while breathing. Underneath the lungs, there is a dome shaped muscle called diaphragm. When the diaphragm contracts, oxygen rich air is pulled inside the lungs. Exchange of gases takes place in the lungs and carbon dioxide is pumped out from the lungs when the diaphragm relaxes.