All aspects of partial pressures
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Carbon dioxide is transported? | 70% as Hydrogen ions in blood
23% combines with haemoglobin
7% dissolved in plasma (increases blood acidity)
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Oxygen is transported? | 97% carried by red blood cells (haemoglobin)
3% dissolved in plasma
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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
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What is Partial pressure | Pressure that is exerted by an individual gas when it is in a mixture of gases
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Why and how do gases move? | From areas of high partial pressure to a lower partial pressure via diffusion
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Where are the two sites for gaseous exchange? | Air in alveoli of lungs and the blood
Tissues/muscles of body and surrounding blood capillaries
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What is a pressure (diffusion) gradient? | Difference in high and low partial pressure. The greater the gradient the greater the diffusion
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Where is blood pO2 is highest? | In the arteries
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Where is blood pCO2 is highest? | In veins leading away from the working muscles
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Created by:
Tina Dean
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