The lungs

    Cards (14)

    • You need to get oxygen into your bloodstream to supply your cells for respiration. You also need to get rid of carbon dioxide from your blood. This all happens in your lungs when you breath air in and out
    • The lungs are in the thorax
      1. The thorax is in the top part of your body
      2. Its separated from the lower part of the body by the diaphragm
      3. The lungs are like big pink sponges and are protected by the rib cage. They’re surrounded by the pleural membranes
      4. The air that you breath in goes through the trachea. This splits into two tubes called bronchi (each one is called a bronchus), one going to each lung
      5. The bronchi split into progressively smaller tubes called bronchioles
      6. The bronchioles finally end at small bags called alveoli where the gas exchange takes place
    • Alveoli carry out gas exchange in the body
    • Alveoli
      • Millions of little air sacs
      • Surrounded by a network of blood capillaries
    • Gas exchange in the alveoli
      1. Oxygen diffuses out of the alveolus into the blood
      2. Carbon dioxide diffuses out of the blood into the alveolus
    • The blood passing next to the alveoli
      Contains lots of carbon dioxide and very little oxygen
    • Oxygen diffuses out of the alveolus
      Into the blood
    • Carbon dioxide diffuses out of the blood
      Into the alveolus to be breathed out
    • Oxygen transport to body cells
      1. Oxygen is released from the red blood cells
      2. Diffuses into the body cells
    • When the blood reaches body cells
      Oxygen is released from the red blood cells
    • Oxygen is released from the red blood cells
      Diffuses into the body cells
    • Carbon dioxide diffuses out of the body cells
      Into the blood
    • Carbon dioxide is carried back to the lungs
      After diffusing into the blood
    • You can calculate the breathing rate in breaths per minute
      Breaths per minute = number of breaths / number of minutes
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