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The Respiratory System Explain the Function of the Respiratory System Explain the Function of the Respiratory System To supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body It is the system of the body that deals with breathing Click here for an interactive diagram of the structures & functions of the respiratory system: http://www.lungusa.org/learn/resp_sys.html What is the pathway oxygen takes through the body? What is the pathway oxygen takes through the body? • • • • • • • Nose & mouth Pharynx Trachea Bronchi Bronchioles Alveoli Capillaries Explain gas exchange in the lungs Explain gas exchange in the lungs • Oxygen in the lungs diffuses through the alveoli, through the capillary wall, and into the blood • Carbon dioxide in the blood diffuses through the capillary wall and into the alveoli Explain gas exchange in the lungs This animation was taken from: http://www.le.ac.uk/pat hology/teach/va/anato my/case2/2_2.html Click the link to read more about gas exchange What causes breathing? What causes breathing? • Inhalation – Rib muscles contract to pull ribs up and out – The DIAPHRAGM muscle contracts to pull down the lungs – Tissue expands to pull in air. • Exhalation – Rib muscles relax – The Diaphragm muscle relaxes – Tissue returns to resting position and pushes air out.