Respiratory System

By: Regina Duer and Sophie Wilcox

About the Respiratory System

Respiration is the process in which oxygen and glucose undergo a complex series of chemical reactions inside cells.

Your respiratory system gets oxygen into the lungs. The oxygen that you breathe comes from the atmosphere, which is the blanket of gases that surrounds the Earth.



We breathe about 20,000 times a day. All of this breathing couldn't happen without help from the respiratory system, which includes the nose, throat, voice box, windpipe, and lungs. With each breath, you take in air through your nostrils and mouth, and your lungs fill up and empty out. As air is inhaled, the mucous membranes of the nose and mouth warm and humidify the air. Although we can't see it, the air we breathe is made up of several gases. Oxygen is the most important for keeping us alive because body cells need it for energy and growth. Without oxygen, the body's cells would die. Carbon dioxide is the waste gas that is produced when carbon is combined with oxygen as part of the body's energy-making processes. The lungs and respiratory system allow oxygen in the air to be taken into the body, while also enabling the body to get rid of carbon dioxide in the air breathed out.

Parts of the Respiratory System

Pharynx- Air moves from the nose downward into the throat, or pharynx. Part of the pharynx is also a passageway for food.


Trachea- The trachea leads from the pharynx toward the lungs. The walls of the trachea are made up of rings of cartilage which protect the trachea and keep it from collapsing.


Lungs- After it reaches the lungs, air moves through smaller and smaller bronchi until it reaches the alveoli, oxygen passes into the blood and carbon dioxide passes out of the blood.


Nose- Air enters the body through two nostrils. The lining of the nose is coated with cilia and mucus, which trap particles and warm and moisten the air.


Bronchus- Air moves from the trachea into the right and left bronchi. One bronchus leads to each lung. Part of each bronchus is outside the lung and part is inside.

This is a video that you can go to to find out more about the Respiratory System