Respiratory system

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Respiratory system

  1. 1. FUNCTIONS Oxygen uptake and exchange  From the atmosphere to the blood (inside the lungs) Carbon Dioxide removal Allows us to speak (air passing across the vocal chords) Expels heat and water vapor (breathed out)
  2. 2. RESPIRATORY SYSTEM (AIR PASSAGES) Major parts of the conducting system: Nasal cavity (nose): warms and filters air. Pharynx (throat): Allows food and air to pass. The air is channeled into the larynx. Larynx (the voice box): Air passes through the larynx on its way to the trachea. Inside the larynx are the vocal cords which creates the ‘voice’.
  3. 3. RESPIRATORY SYSTEM (AIR PASSAGES) Trachea (wind pipe): The airway through which the air passes on its way to the bronchi. Bronchi: Are divided into 2 smaller bronchioles, then divided into even smaller bronchioles and so on until the terminal bronchioles are reached. Terminal Bronchioles: The terminal bronchioles branch yet again to form respiratory bronchioles which also branch to form alveoli or air sacs.
  4. 4. ALVEOLI Alveoli (air sacs): are tiny air sacs at the end of the respiratory bronchioles. Millions of alveoli are surrounded by capillaries. This is where oxygen is exchanged for carbon dioxide in the blood.
  5. 5. WHERE DOES THE AIR (OXYGEN) GO?
  6. 6. Diaphragm contracts Ribcage enlarges Chest cavity volume increases Intercostals (muscles) between ribs help keep chest open The enlargement of the chest cavity decreases pressure in the lungs The reduction in pressure inside the chest causes a sucking effect – air flows into the lungs The normal amount of air breathed in per breath is about 500ml. This can increase by 4-5 times when exercising. MECHANICS OF BREATHING - INSPIRATION
  7. 7. Expiration occurs when the diaphragm and intercostal muscles relax This again creates enough pressure (squeeze) to force the air out of the lungs Again, during exercise, this process will be faster – and the abdominals will also assist with this process. MECHANICS OF BREATHING - EXPIRATION

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