Breathing And Gas Exchange

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  • Created by: Juliet
  • Created on: 28-03-13 05:12

BREATHING AND GAS EXCHANGE!

BREATHING

For Cellular respiration to take place, your cells need a constant supply of oxygen for this to

happen aerobically. Cells need to have waste Carbon Dioxide removed.

INHALATION

  • Volume of chest cavity increases
  • Diaphragm muscles contract -> Diaphragm flattens
  • External intercostal muscles contract -> Pulls ribcage up and out
  • Lower pressure in chest cavity than outside body -> Air flows in 

EXHALATION

  • Volume of chest cavity decreases
  • Diaphragm muscles contract -> Diaphragm dome shaped
  • Internal intercostal muscles contract -> Pulls ribcage down and in
  • Higher pressure inside the chest cavity than outside body -> air pushed out

STRUCTURE OF HUMAN GAS EXCHANGE

  • Nasal passages = Warm, clean, addmoisture to the air
  • Epiglottis = Stops food getting into lungs when you swallow
  • Oesophagus = Carries food to stomach
  • Larynx = Voice box
  • Trachea = Tube with incomplete rings of cartilage that carries air to lungs. Lined with cells making mucus and cillia which move

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