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AS Partial pressure
All aspects of partial pressures
| Question | Answer |
|---|---|
| Carbon dioxide is transported? | 70% as Hydrogen ions in blood 23% combines with haemoglobin 7% dissolved in plasma (increases blood acidity) |
| Oxygen is transported? | 97% carried by red blood cells (haemoglobin) 3% dissolved in plasma |
| What are structures at alveoli that help diffusion | Thin alveolar membrane (small distance for gases to travel Numerous alveoli Vast capillary network Diameter of capillaries smaller than blood cell therefore slow blood flow |
| What is Partial pressure | Pressure that is exerted by an individual gas when it is in a mixture of gases |
| Why and how do gases move? | From areas of high partial pressure to a lower partial pressure via diffusion |
| Where are the two sites for gaseous exchange? | Air in alveoli of lungs and the blood Tissues/muscles of body and surrounding blood capillaries |
| What is a pressure (diffusion) gradient? | Difference in high and low partial pressure. The greater the gradient the greater the diffusion |
| Where is blood pO2 is highest? | In the arteries |
| Where is blood pCO2 is highest? | In veins leading away from the working muscles |
Created by:
Tina Dean
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