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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