Structure of the Human Gas Exchange System

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  • Created on: 05-04-13 12:44
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Nasal passages Warm, clean and add moisture to the air
Epiglottis Stops food getting into lungs when you swallow
Oesophagus Carries food to stomach
Larynx Voice box
Trachea Tube with incomplete rings of cartilage carries air to lungs; lined with cells
making mucus, and cells with cilia which move the mucus away from the lungs
Left bronchus Carries air to lungs
Bronchioles Carry air to lungs
Alveoli Tiny air sacs adapted for gaseous exchange
Diaphragm Sheet of muscles with a fibrous middle part which is domed; it helps makes
breathing movements and separates the thorax from the abdomen
Ribs Bones that protect and ventilate the lungs
Internal intercostals Pulls ribs down and in when you breathe out
External intercostals Pulls ribs up and out when you breathe in
Pleural membranes Thin moist membranes forming an airtight seal around lung and separating
inside of thorax from lungs
Pleural fluid Liquid filling pleural cavity and acting as lubrication, so surfaces of lungs do not
stick to inside of chest wall


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