respiratory system

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WordNet Dictionary
	Definition:		[n]  the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing
	Synonyms:		systema respiratorium
	See Also:		body, organic structure, physical structure, respiratory organ, respiratory tract, system, trachea
Medical Dictionary
	Definition:		the group of organs responsible for carrying oxygen from the air to the bloodstream and for expelling carbon dioxide.