Life Science 2.4 : The Respiratory System

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  • 1. Life Science 2.4
    The Respiratory System
  • 2. Objectives:
    Describe the parts of the respiratory system and their functions.
    Explain how breathing happens.
    Discuss the relationship between the respiratory system and the cardiovascular system.
    Identify two respiratory disorders.
  • 3. Respiration and the Respiratory System
    Process by which a body gets and uses oxygen and releases carbon dioxide and water.
    Breathingis only one part of respiration.
    Cellular respiration
    Second part of respiration.
    Involves chemical reactions that release energy from food.
    Respiratory system
    Group of organs that take in oxygen and get rid of carbon dioxide.
  • 4.
  • 5. Nose, Pharynx, and Larynx
    Your nose is the main passageway into and out of the respiratory system.
    From the nose, air flows into the pharynx, or throat.
    The larynx is the part of the throat that contains the vocal chords.
  • 6. Trachea
    The larynx guards the entrance to a large tube called the trachea, or windpipe.
    Bronchi and Alveoli
    The trachea splits into two branches called bronchi.
    One bronchus connects to each lung.
    In the lungs, each bronchus branches into bronchioles, which branch to form thousands of tiny sacs that are called alveoli.
  • 7. Breathing
    Breathing is done by the diaphragm and rib muscles.
    The diaphragm is a dome-shaped muscle beneath the lungs.
    In cellular respiration, oxygen is used by cells to release energy stored in molecules of glucose.
    When you breathe, you take in oxygen, which diffuses into red blood cells and is carried to tissue cells.
    Breathing and Cellular Respiration
  • 8. Respiratory Disorders
    Respiratory disorders include asthma, emphysema, and severe acute respiratory syndrome (SARS).
    Asthma causes the bronchioles to narrow. An asthma attack may be triggered by irritants such as dust or pollen.
    SARS is caused by a virus.