The respiratory system

 Respiration

Respiration is the process in which oxygen is taken in,and carbon dioxide is released from the body.During this process there is a breakdown of food that results in the release of energy.The Respiratory system,in human beings consists of the following-Nasal Cavity,
Pharynx,Wind Pipe,Lungs,Diaphragm.
                                                   Parts of  Respiratory System
 Nasal Cavity-
                                Air enters the nose through the Nasal Cavity. As air passes through the  Nasal Cavity,it gets warmed up and also get filtered.The hair presents in the nostrils stop the dust and germs from entering the Respiratory System.

Pharynx-
                      The nasal cavity leads into an organ called the Pharynx.From the Pharynx,air passes into the chamber called the larynx.The larynx produces sound and is also called the voice box.The opening of pharynx into larynx is guarded by the valve called the epiglottis.

Wind pipe-
                         The Wind pipe is a tube situated in front of food pipe in the neck.It is about 12 cm in length and 2.5 cm in diameter.

Lungs-
                 The bronchi lead into the Lungs which are situated in either side of the chest cavity.
Lungs contains number of air sacs and blood vessels.When air enters the lungs ,the blood vessels around the air sacs take in oxygen and give out carbon dioxide and water.

Diaphragm-
                             Lungs cannot move by themselves it is the movement of diaphragm and the mussels


Diagram of  Respiration system-

    Diagram of Air Sacs-