respiratory system - the organs involved in breathing, breathing - the process of taking air into the lungs and then releasing it, respiration - the inhaling of oxygen and exhaling of carbon dioxide, trachea - the windpipe; main tube that carries air to your lungs, bronchi - main passageways into the lungs, one for each lung, carbon dioxide - a waste gas that leaves our bodies when we exhale, alveoli - tiny air sacs in the lungs, where oxygen enters and carbon dioxide leaves the blood, inhale - to breathe in, exhale - to breathe out, diaphragm - muscle between the lungs and stomach that is used when you breathe, lungs - breathing organs located in the chest,

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