Nose - takes in air, filters the air, Trachea - takes air down to the lungs, alveloi - air sac for gas exchange, diaphragm - sheet of muscle found under the lungs, intercostal muscles - muscles between the lungs, oxygen - gas we breathe in, carbon dioxide - gas we breathe out, red blood cell - transports oxygen, lime water - chemical used to test for carbon dioxide, inhalation - process of breathing in, exhalation - process of breathing out , contract - what happens the diaphragm and intercostal muscles when we inhale,

Breathing system

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