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The Respiratory System http://137.222.110.150/calnet/irish_cal/exotics/respiratory%20system.jpg The system of the body that deals with breathing The body takes in the oxygen that it needs and removes the carbon dioxide that it doesn’t The Oxygen Delivery System • Main function - to supply the blood in the circulatory system with oxygen • Does this through breathing Breathing and Respiration are NOT the same thing! Breathing Moving air in and out of the lungs Cellular Respiration • Chemical reaction that releases energy • Occurs in the mitochondria of the cell (called cellular respiration) Inhalation • Breathing in • Body gets oxygen from the air • Rib muscles contract to pull ribs up and out • Diaphragm muscle contracts to pull down the lungs • Tissue expands to force (pull) in air. Exhalation • • • • • Breathing out Get rid of carbon dioxide Rib muscles relax Diaphragm muscle relaxes Tissue returns to resting position and forces (pushes) air out Parts of the Respiratory System • Mouth • Nose • Trachea – splits into bronchi – bronchioles • Lungs – Bronchioles – Alveoli • Diaphragm http://www.nlm.nih.gov/medlineplus/ http://www.nlm.nih.gov/medlineplus/ http://biology.clc.uc.edu/courses/bio105/respirat.htm Pathway of Oxygen 1. Air into nose or mouth 2. The air moves through the pharynx and larynx and the epiglottis opens. 3. Air goes to the Trachea 9. Bloodstream 8. Capillaries (picks up O2 and drops off CO2) 7. Alveoli 4. Bronchi 5. Lungs 6. Bronchioles Nose Mouth Pharynx Larynx Trachea Lungs Bronchi Bronchi Bronchioles Diaphragm Alveoli Pathway of Carbon Dioxide 1. Bloodstream 2. Capillaries (drops off CO2 and picks up O2) 3. Alveoli 4. Bronchioles 9. Air out of nose or mouth 8. Epiglottis opens then CO2 moves through larynx and pharynx 7. Trachea 6. Bronchi 5. Lungs Lungs • • • • Main organs of the respiratory system Bronchial tubes Many smaller tubes Alveoli (alveolus) – surrounded by capillaries • Average adult's lungs contain about 600 million of these air-filled sacs http://users.tpg.com.au/users/amcgann/body/respiratory.html Bronchi • The trachea splits into 2 tubes, 1 to each lung • The bronchi splits into smaller branches in the lungs called bronchioles Alveoli • Tiny sacks surrounded by capillaries • Where gas exchange occurs • Capillaries pick up oxygen and drop of carbon dioxide http://users.tpg.com.au/users/amcgann/body/respiratory.html http://www.mtsinai.org/ The Diaphragm • The muscle that controls the breathing process. • The diaphragm flattens to cause the chest to expand and air is pulled into the lungs. • When the diaphragm relaxes, the chest collapses and the air in the lungs is forced out. http://users.tpg.com.au/users/amcgann/body/respiratory.html