inhalation and exhalation

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1. which of these cause the diaphragm to flatten during inhalation

  • external intercostal muscles contract
  • gaseous exchange
  • diaphragm muscles contract
  • volume of chest cavity expands
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2. which one of these is a main advantage for an alveolus carrying out its jobs

  • long distance between itself and the blood supply
  • rich blood supply
  • low surface area
  • close to the heart

3. which of these cause the ribcage to move up and out during inhalation

  • external intercostal muscles contract
  • bronchioles
  • diaphragm muscles contract
  • high diffusion gradient

4. what allows air to flow into the lungs during inhalation

  • the heart
  • alveoli
  • lower pressure in the lungs than outside the body
  • pleural membrane

5. during exhalation which of these pull the ribs down and in

  • pleural membrane
  • chest cavity
  • intercostal muscles
  • diaphragm muscles

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