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AS Bohr & Gases

Transport of gases and AVO2 Bohr shift

QuestionAnswer
How carbon dioxide is transported? 70% as Hydrogen ions in blood 23% combines with haemoglobin 7% dissolved in plasma (increases blood acidity)
How oxygen is transported? 97% carried by red blood cells (haemoglobin) 3% dissolved in plasma
What are the two sites for gaseous exchange? Air in alveoli of lungs and the blood Tissues/muscles of body and surrounding blood capillaries
Where is myoglobin found? In muscles it is used as a oxygen store and has a higher affinity than haemoglobin
What causes the Bohr shift? Increase in carbon dioxide and lactic acid production Increases acidity of blood Increase in blood and muscle temperature
The Bohr shift causes the curve to move in which direction and why? Curve moves to the right which allows more oxygen to be given up
What is the arterial venous oxygen difference (a-VO2 diff)? The difference in the oxygen content of the artery and the veins. It represents the amount of oxygen extracted by the muscles
Created by: Tina Dean
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