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Throat (pharynx) Voice box (larynx) Windpipe (trachea) Bronchial tube Lung cover (pleura) Diaphragm Respiratory System Function: GAS EXCHANGE Allows organism to obtain OXYGEN and remove CARBON DIOXIDE & WATER The Pathway of Air To begin, outside air passes through: Nasal passage: passage lined with MUCUS and CILIA (hairs) Function: Function FILTERS, MOISTENS, WARMS the air What is the purpose of filtering, moistening and warming the air? The Pathway of Air Cont’d Pharynx: (throat) TRACHEA (windpipe): lined with CILIA and MUCUS, it’s supported by rings of CARTILAGE Watch Cilia Sweep particles away!! Feel your trachea, run your fingers down the front of your neck!! (bumps are rings of cartilage) The Pathway of Air Cont’d After the TRACHEA into the: BRONCHI (2): directs air into the lungs Branch out (get smaller and smaller) like the branches on a tree!! **called bronchioles** LUNGS (2): main organ of respiratory system The Pathway of Air Cont’d At the end of the bronchi: ALVEOLI: little “grape-like clusters” that perform GAS EXCHANGE. •Oxygen in alveoli diffuses into capillaries •Carbon Dioxide diffuses from capillaries into alveoli Gas Exchange