Gas exchange
- Created by: elen roberts
- Created on: 02-05-13 21:03
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- Exchange
- Ficks law
- Rate of diffusion = S.A x concentration difference/distance
- Large S.A
- High concentration gradient
- Small distance
- Alveoli
- Large S.A
- Millions of alveolus
- Small distance
- Single layer of flattened epithelial cells, alveolus and capillarys
- High concentration gradient
- Blood flow in capillaries . Ventilation in lungs
- Large S.A
- Mechanism of breathing
- Diaphragm and intercostal muscles contrat
- Transmitted to lungs by fluid filled pleural sac, increasing volume of thorax
- Increased volume of thorax decreases pressure in the lungs, air is drawn in
- Pulmonary ventilation
- ventilation rate x tidal volume
- Ventilation rate ( breaths per min.)
- 60/cycle time
- Tidal volume
- Diaphragm and intercostal muscles contrat
- Lungs
- Thorax changes shape and size due to intercostal muscles and diaphragm.
- Ficks law
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