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The respiratory system


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The respiratory system

  1. 1. The Respiratory System 7SCIENCE Fri., Nov. 19
  2. 2. Why study the respiratory system? • What do humans need to survive? • Humans need many things to survive, one is food and the other is air • We are ALWAYS breathing • Breathing: – the process where fresh air moves into your lungs and stale air moves out of your lungs
  3. 3. Connected to the digestive system • The digestive system prepares and stores energy from digested food in your cells • Respiration: the process of releasing this energy through using oxygen – Oxygen is required to release the energy from cells • Carbon dioxide (what we breathe out) is a waste product from this respiration
  4. 4. Main organs of the respiratory system • Nasal cavity • Pharynx • Larynx • Trachea • Bronchi (Bronchioles) • Lungs
  5. 5. Nasal Cavity, Pharynx, Larynx • Nasal cavity: Air enters through your nose or mouth • Pharynx – Tube that food and air pass through – Epiglottis: a flap of muscle that prevents food from entering the larynx • Larynx – Airway that attaches to vocal cords • As air passes over vocal cords, the muscles vibrate and tighten or loosen to make a sound (speaking!)
  6. 6. Trachea, Bronchi • Trachea: – Found below the larynx and is made of cartilage rings • Bronchi: – At the end of the trachea you have branches that carry air into the lungs – These split into smaller branches called bronchioles
  7. 7. Lungs, Alveoli • Lungs: – Take up most of the space in the chest – Bronchi enter the lungs and split into bronchioles (smaller tubes) – At the end of these tubes are clusters of tiny sacs, called alveoli • Alveoli – Where exchange of oxygen and carbon dioxide takes place – Happens easily because alveoli have walls that are one cell thick