By Matthew Bullock and Dorell Johnson The Respiratory systems job is to provide oxygen to the red blood cells that we need to live. Structures Involved The basic respiratory structures that help your body obtain oxygen are: Air ways, lungs, respiratory muscles. Trachea the trachea, is the tube that connects the larynx to the lungs and allows air passage. Not all vertebrates have Trachea, only non-fish. Lungs! Structure- Function- body/systems/respiratory/lung.htm