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BDSYS2

Respiratory System

OrganFunction
Mouth, nose & nasal cavity The function of this part of the system is to warm, filter and moisten the incoming air
Pharynx Here the throat divides into the trachea (wind pipe) and oesophagus (food pipe). There is also a small flap of cartilage called the epiglottis which prevents food from entering the trachea
Larynx This is also known as the voice box as it is where sound is generated. It also helps protect the trachea by producing a strong cough reflex if any solid objects pass the epiglottis.
Trachea It's a tube which carries air from the throat into the lungs. The inner membrane of the trachea is covered in tiny hairs called cilia.
Bronchi The trachea divides into two tubes called bronchi, one entering the left and one entering the right lung. Once inside the lung the bronchi split several ways, forming tertiary bronchi.
Bronchioles Tertiary bronchi continue to divide and become bronchioles, very narrow tubes, less than 1 millimeter in diameter. There is no cartilage within the bronchioles and they lead to alveolar sacs.
Alveoli Individual hollow cavities contained within alveolar sacs (or ducts). Alveoli have very thin walls which permit the exchange of gases Oxygen and Carbon Dioxide. approximately 3 million alveoli within an average adult lung.
Diaphragm The diaphragm is a broad band of muscle which sits underneath the lungs, attaching to the lower ribs, sternum and lumbar spine and forming the base of the thoracic cavity.
Created by: ajmitchell