lungs
- Created by: Sophie Gibbons
- Created on: 07-01-13 11:26
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- Lungs
- Mechanisms of breathing
- Ventilation - the movement of air in and out of the lungs
- Inspiration - the process by which air is brought into the lungs
- Expiration - the process by which air is forced out of the lungs
- Diaphragm - sheet of muscle, seperates thorax from abdomen
- Intercostal muscles - lie between the ribs, involved in inspiration and expiration
- Inpiration
- Active process
- External intercostal muscles contract while the internal relax
- Ribs move up and out and the diaphragm contracts causing it to flatten
- This increases the volume and decreases the pressure
- Atmospheric pressure is greater than pulmonary pressure so air moved into the lungs.
- This increases the volume and decreases the pressure
- Ribs move up and out and the diaphragm contracts causing it to flatten
- Expirtation
- Passive process
- Internal intercostal muscles contract while the external relax
- Ribs move down and in, diaphragm relaxs returnin to its dome shape
- Decreases the volume increasiing the pressure
- Pulmonary pressure is greater than atmospheric pressure so air moves out
- Decreases the volume increasiing the pressure
- Ribs move down and in, diaphragm relaxs returnin to its dome shape
- Pulmonary ventilation
- Total volume of air breathed into the lungs in one minute
- Pulmonary venti = tidal volume x ventilation rate
- Tidal volume - volume of air taken in in one breath
- Ventilation rate - number of breaths per minute
- Features of exchange surfaces
- Untitled
- Mechanisms of breathing
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