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The Respiratory System

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Presentation on theme: "The Respiratory System"— Presentation transcript:

1 The Respiratory System

2 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

3 The Oxygen Delivery System Main function - to supply the blood in the circulatory system with oxygen Does this through breathing

4 Breathing and Respiration are NOT the same thing!

5 Breathing Moving air in and out of the lungs

6 Cellular Respiration Chemical reaction that releases energy Occurs in the mitochondria of the cell (called cellular respiration)

7 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.

8 Exhalation Breathing out Get rid of carbon dioxide Rib muscles relax Diaphragm muscle relaxes Tissue returns to resting position and forces (pushes) air out

9 Parts of the Respiratory System Mouth Nose Trachea –splits into bronchi –bronchioles Lungs –Bronchioles –Alveoli Diaphragm




13 Pathway of Oxygen 1.Air into nose or mouth 3. Air goes to the Trachea 4. Bronchi 5. Lungs6. Bronchioles 7. Alveoli 8. Capillaries (picks up O 2 and drops off CO 2 ) 9. Bloodstream 2. The air moves through the pharynx and larynx and the epiglottis opens.

14 Nose Mouth Pharynx Larynx Trachea Lungs Bronchi Bronchioles DiaphragmAlveoli

15 Pathway of Carbon Dioxide 9. Air out of nose or mouth 7. Trachea 6. Bronchi 5. Lungs4. Bronchioles 3. Alveoli 2. Capillaries (drops off CO 2 and picks up O 2 ) 1. Bloodstream 8. Epiglottis opens then CO 2 moves through larynx and pharynx

16 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


18 Bronchi The trachea splits into 2 tubes, 1 to each lung The bronchi splits into smaller branches in the lungs called bronchioles

19 Alveoli Tiny sacks surrounded by capillaries Where gas exchange occurs Capillaries pick up oxygen and drop of carbon dioxide



22 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.


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