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The Respiratory System Breathe in Breath out What Does the Respiratory System Do? ✦ Brings oxygen in ✦ Lets carbon dioxide out ✦ ✦ Waste product made by the cells Together, this system is called Respiration The Pathway of Air... ✦ Enters the body through mouth and nasal cavities ✦ Flows into the pharnyx (throat) ✦ Then to the larynx (voice box) ✦ The trachea (windpipe) then carries air to the lungs How Does it Flow? ✦ The rib muscles and diaphragm pull air in and out ✦ contract = in ✦ relax = out What Controls Breathing Rate? ✦ Centers in the brain stem detect carbon dioxide in the blood ✦ Carbon dioxide is toxic = it must not build up in blood ✦ Brain stem signals diaphragm to contract more = breathe faster = rids system of excess carbon dioxide ✦ When too little carbon dioxide, the opposite happens