Breathing and Ventilation
- Created by: Tommy1boy
- Created on: 08-05-15 10:11
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- Ventilation and breathing
- Breathing
- Breathing In
- 1) Rib cage moves out and up
- 2) The diaphragm becomes flatter
- 3) Increases the volume inside the thorax
- 4) Reduces the pressure inside the thorax
- 5) Air enters the lungs
- Breathing Out
- 1) The rib cage moves down and in
- 2) The diaphragm moves upwards into a domed shape
- 3) This reduces the volume and pressure inside the thorax
- 4) Air leaves the lungs
- Breathing In
- Artificial ventilators
- Overview
- Used when someone is unable to breath by themselves
- Carries a risk and so care must be taken
- Manual ventilators
- Often used in first aid
- A mask is attached to a bag and is place over the mouth and nose
- The bag can be squeezed, pushing air into the lungs
- Mechanical ventilators
- Negative pressure machines (Iron Lungs)
- Used in cases of paralysis (due to polio for example)
- Thorax is inside a metal box that can create a very low pressure outside the lung
- This causes the thorax to expand so air enters the lungs
- Positive pressure machines
- These attach by a tube and mask to the mouth and nose
- Used during surgery or when unconscious
- Air enters the lungs under high pressure
- More modern
- Negative pressure machines (Iron Lungs)
- Overview
- Breathing
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