The Respiratory System
The respiratory system is made up of the nose, nasal cavity, pharynx, trachea, bronchi and the lungs. It performs many functions and is necessary to provide all living cells of the body with oxygen.



Gas exchange - The respiratory system allows for oxygen to enter the blood and for carbon dioxide to leave the blood. The respiratory system works in conjunction with the cardiovascular system to do this.

Regulation of blood - The respiratory system can regulate blood pH by altering the amount of carbon dioxide in the blood.
Producing a voice - Air moving through the vocal cords creates a voice.

Sense of smell - Airborne molecules entering the nasal cavity allows the body to register different smells.

Immune System - The respiratory system stops some microorganisms from entering the body or removes them from respiratory surfaces. This can help prevent you from becoming sick.

Seeley, R.R., Stephens, T.D. & Tate, P. (2003) ‘Essentials of Anatomy and Physiology’, 6th Ed., Mc Graw-Hill.

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