The Respiratory System

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  • 1. The Respiratory System Ms. Bennett’s Living Environment A Study Guide
  • 2. The Purpose of the Respiratory System
    • In with the good, out with the bad
  • 3. The Parts of the Respiratory System
  • 4. Nasal Cavity and Nasal Passages
    • Air enters through nostrils and mouth
    • Passages lined with cilia and mucous membranes
    • Cilia filters air
    • Mucous membranes warm the air
  • 5. Pharynx and Larynx
    • Houses the glottis-opening to the trachea
    • The epiglottis is a flap that covers the glottis during swallowing to prevent food from going down the trachea
    • Voice box- allows you to speak
  • 6. Trachea
    • Kept open by rings of cartilage
    • Trachea divides into two branches called bronchi
    • Cilia beat in one direction to get foreign particles out
  • 7. Bronchi and Bronchioles
    • Lined with cilia and mucous membranes
    • Bronchioles are branches off of the bronchi
    • Bronchioles continue to divide, ending in alveoli
  • 8. Alveoli
    • Responsible for gas exchange (O2, CO2)
    • Increase the surface area of the lungs
    • Tiny air sacs surrounded by capillaries
    • Double Diffusion
  • 9. Lungs
    • Made up of bronchus, bronchioles, and alveoli
    • Air enters and leaves lungs due to changes in air pressure causes by the expansion and contraction of your diaphragm
    • Lung Machine: Diaphragm moves up and down creating unequal pressure in the chest cavity. This allows inhalation and exhalation to occur.
  • 10. Diaphragm
    • Inhale - diaphragm moves down as air is forced into your lungs
    • Exhale - diaphragm moves up to its original curved position which forces air out of the lungs