Given below is a part of the human respiratory system showing the air passage in the nose and throat. Read the information below the diagram and fill in the blanks with the technical terms of each structure.

Human respiratory system consists of organs from nose to lungs. These organs are responsible for air passage and the diffusion of respiratory gases (oxygen and carbon dioxide) into the blood stream.

The (a) …………… helps to breathe and smell. The nasal chamber opens at the back into a wide cavity, called (b) …………… situated at the back of the mouth. It leads into an air tube, called (c) …………… and the (d) …………… located dorsally behind the windpipe. The entrance to the windpipe is guarded by a flap called (e) ………….. which closes at the time of swallowing food.

The Nose helps to breathe and smell. The nasal chamber opens at the back into a wide cavity, called Pharynx situated at the back of the mouth. It leads into an air tube, called Trachea and the Oesophagus located dorsally behind the windpipe. The entrance to the windpipe is guarded by a flap called Epiglottis which closes at the time of swallowing food.