Unit 4 - Gas Exchange

    Cards (26)

    • What is the primary job of the lungs?
      Lungs are the organs of Breathing
    • How many lobes does the left lung have?
      Two lobes
    • How many lobes does the right lung have?
      Three lobes
    • Why is the left lung smaller than the right lung?
      The left lung is smaller as it fits around the heart
    • What is gas exchange?
      The process of oxygen and carbon dioxide moving between the lungs and the blood
    • What is the texture of the lungs?
      Very spongy
    • What is the function of the trachea?
      Carries air into the lungs from the mouth and nose
    • What prevents the trachea from collapsing?
      Rings of cartilage
    • What do bronchi do?
      Carry air into each lung
    • What are bronchioles?
      Smaller tubes carrying air from bronchi to alveoli
    • What is the function of alveoli?
      Site of gas exchange. Where oxygen enters the blood and carbon dioxide is removed from the blood
    • What is the diaphragm's role in breathing?
      Changes shape to allow breathing
    • What protects the heart and lungs?
      Ribcage
    • What is inhalation?
      Taking air into the lungs
    • What do intercostal muscles do during inhalation?
      Contract to move ribcage up
    • What happens during exhalation?
      Air is pushed out of the lungs
    • What happens to the diaphragm during exhalation?
      Relaxes and becomes dome-shaped
    • What is the effect of inhalation on chest volume?
      Increases the volume of the chest
    • What happens to lung pressure during inhalation?
      Decreases the pressure in lungs
    • Where does gas exchange occur?
      In the alveoli
    • What are the features of alveoli that aid gas exchange?
      Moist, thin walls, large surface area
    • What is diffusion in the context of gas exchange?
      Movement from high to low concentration
    • What gas diffuses from alveoli into blood?
      Oxygen
    • What gas diffuses from blood into alveoli?
      Carbon dioxide
    • What are capillaries?
      Tiny blood vessels
    • How do gases move in the alveoli?
      By diffusion
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