Air cavity - Space within the lungs which can be filled with gas., Diffusion - Process of gas moving down a concentrated gradient., Gaseous exchange - Oxygen and carbon dioxide diffuses in the lungs., Alveoli - Tiny air sacs in the lungs where gases are exchanged., Bronchi - Two branches at the end of the trachea which enter the lungs., Capillaries - Very narrow tubes that surround the alveoli and carry blood., Bronchioles - Divisions of the bronchi which lead to the alveoli., Air pressure - Pressure that a gas exerts which is determined by the number of molecules of the gas within an area., Diaphragm - Dome-shaped muscle which contracts and relaxes in order to alter the volume of the chest cavity., Trachea - Windpipe which allows air to pass down the throat and into the lungs., Exhalation - Process by which gas is expelled from the lungs., Tidal volume - Volume of air inhaled or exhaled per breath., Haemoglobin - Oxygen combines with this in the red blood cells and transported around the body., Minute ventilation - Amount of air inhaled and exhaled each minute., Vital capacity - Maximum amount of air you can breathe out, after breathing in deeply., Oxyhaemoglobin - Compound produced when oxygen and haemoglobin combine., Inhalation - Process by which gas is taken into the lungs., Intercostal muscles - Muscles that control movement of the ribs during breathing., Ribcage - Collection of bones which protect the heart and lungs and also aids breathing., Breathing frequency - Number of breaths per minute.,

Respiratory system - Key words

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