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Lungs and Respiratory system
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  1. Lungs and Respiratory system How do we get oxygen into the body?

  2. Why do we need oxygen? • Aerobic cells need oxygen to make energy • (remember the yeast lab?)

  3. Human Respiratory system • Path of oxygen: • Mouth/nose  pharynx  larynx  trachea  bronchi  lung • Lungs have these parts: • Bronchi  bronchioles  alveoli

  4. Nose • Function: prevent dust from getting into the lungs. • Structures: • Hair traps dust • Mucus traps dust

  5. Pharynx (again!) • Function: prevent food getting into the lungs • Structure: epiglottis, flap, closes when you swallow

  6. Larynx • Function: speaking • Structure: contains the vocal cords

  7. trachea • Function: passage of air • Structure: surrounded by cartilage

  8. Bronchi • Function: passage of air • Two tubes that split from the trachea

  9. Bronchioles • Function: passage of air • Structure: separates into smaller branches

  10. alveoli • Function: site of gas exchange • Structure: very thin walls, surrounded with capillaries. • Gas is carried in the blood by hemoglobin in RBC’s

  11. Breathing • The diaphragm is the muscle responsible for breathing • When it contracts it expands the chest cavity. Negative pressure pulls air into the lungs • http://www.youtube.com/watch?v=hp-gCvW8PRY

  12. Breathing • Breathing is controlled not by how much oxygen you have but by much CO2 is in your blood. • What can you do to hold your breath longer?

  13. Smoking and lung cancer?