Monday 10 March 2014

The effects of fibrosis, asthma and emphysema on lung function.

Fibrosis
Scars in the lung tissue thicken the alveoli increasing the diffusion distance, decrease the volume in the lungs and reduce elasticity. This means that less air can be taken in, and oxygen diffuses more slowly decreasing the bodies supply.

  • Shortness of breath- attempt to increase oxygen supply
  • Cough- reflex to obstruction of the scars
  • Pain- increased pressure
  • Fatigue- lack of oxygen for respiration so less ATP (energy) is produced
Asthma
An allergic reaction causes white blood cells to release histamine, a chemical which inflames breathing pathways and constricts them (by contracting muscles)  and increases mucus.
  • Difficulty breathing- constriction, inflammation and mucus
  • Wheezing- constriction
  • Tight feeling- lungs can't ventilate because of airway constriction
  • Coughing- reflex to obstruction
Emphysema
Elastic tissue in the lungs looses its elastic properties due to smoking. The lungs can't recoil to push air out effectively, and so old air is not replenished and there is a reduced diffusion gradient. Alveoli break down so surface area and the walls thicken so the diffusion distance is increased. Due to these factors less oxygen can diffuse into the blood.
  • Shortness of breath- attempt to increase oxygen supply
  • Cough- reflex to obstruction of damaged tissue
  • Blueish skin- low oxygen levels in the blood

3 comments:

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