6.8 Exchange of Gases in the lungs
- Created by: germaineconroy
- Created on: 04-02-18 17:41
View mindmap
- 6.8 Exchange of Gases in the lungs
- Role of alveoli in GE
- 300 mil alv each human lung. Total SA = 70m(/\2) - half tennis court
- Lined w/ epithelial cells - thin.
- Around each alv = pulmonary capillaries - narrow - RBC flattened against cm - Capillaries - 1 cell thick -
- Diff gases BTWN alveoli & blood rapid
- RBC slowed as pass = more diff time
- Dist btwn alv air & capillaries v thi = short diff path
- Alveoli & pulmonary capillaries = v large total SA
- Steep conc grd maint. by brathing movements + action of heart const circulates blood
- Blood flow through pulmonary capillaries maint conc gradient
- RBC slowed as pass = more diff time
- 300 mil alv each human lung. Total SA = 70m(/\2) - half tennis court
- Role of alveoli in GE
Comments
No comments have yet been made