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Gr.7-Bio-Respiratory System

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  • What is the percentage of oxygen in inhaled air?
    About 21%
  • What happens to the air pressure inside the chest when you inhale?
    The pressure decreases, causing air to move into the lungs.
  • What is the percentage of carbon dioxide in exhaled air?
    About 4%
  • What is the percentage of carbon dioxide in inhaled air?
    About 0.04%.
  • What happens to the chest volume when you inhale?
    The volume inside the chest increases.
  • What happens to the intercostal muscles when you inhale?
    They contract, pulling the ribcage up and out.
  • Where does gas exchange take place?
    In the alveoli (air sacs) of the lungs.
  • What is the function of the pleura?
    It produces a slippery liquid that helps the lungs move easily when breathing.
  • What happens to the intercostal muscles when you exhale?
    They relax, allowing the ribcage to move down and in.
  • What happens to the air pressure inside the chest when you exhale?
    The pressure increases, pushing air out of the lungs.
  • What is the percentage of oxygen in exhaled air?
    About 16%.
  • What is the main function of the lungs?
    To exchange oxygen and carbon dioxide
  • What happens to the diaphragm when you exhale?
    It relaxes and moves upward.
  • What happens to the chest volume when you exhale?
    The volume decreases.
  • What happens to the diaphragm when you inhale?
    It contracts and moves downward.
  • How do cilia in the bronchi help protect the lungs?
    They move mucus and trapped microorganisms out of the lungs.
  • What is the difference between aerobic respiration and breathing?
    Breathing moves air in and out of the lungs, while aerobic respiration uses oxygen to release energy from glucose in cells.
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