Gaseous Exchange Flashcards
Definition of gaseous exchange:
Exchange of oxygen and carbon dioxide via diffusion (high pressure to low pressure)
Definition of partial pressure:
Pressure exerted by an individual gas held in a mixture of gases
What are the two sites of gaseous exchange in the body?
Lungs (external respiration)
Muscles (internal respiration)
External Respiration: PP of O2 between alveoli and capillary blood (at rest)
105 mm/Hg -> 40 mm/Hg
External Respiration: PP of CO2 between capillary blood and alveoli (at rest)
46 mm/Hg -> 40 mm/HG
Internal Respiration: PP of O2 between capillary blood and muscle (at rest)
100 mm/Hg -> 40 mm/Hg
Internal Respiration: PP of CO2 between muscle and capillary blood (at rest)
46 mm/Hg -> 40 mm/Hg
External Respiration: PP of O2 between alveoli and capillary blood (during exercise)
105 mm/Hg -> 5 mm/Hg
External Respiration: PP of CO2 between capillary blood and alveoli (during exercise)
80 mm/Hg -> 40 mm/Hg
Internal Respiration: PP of O2 between capillary blood and muscle (during exercise)
100 mm/Hg -> 5 mm/Hg
Internal Respiration: PP of CO2 between muscle and capillary blood (during exercise)
80 mm/Hg -> 40 mm/Hg
Association definition:
Haemoglobin attaches and combines with oxygen
Dissociation definition:
Haemoglobin detaches from and releases oxygen
What does the oxyhaemoglobin dissociation curve show?
Graph to show the relationship between pO2 and % saturation of haemoglobin
Which 4 factors affect haemoglobin affinity with oxygen?
PP of O2 (increase -> increase)
Acidity of muscle conditions and blood (increase -> decrease)
PP of CO2 (increase -> decrease)
Temperature of muscles and blood (increase -> decrease)
What is the Bohr Shift?
A move in the oxyhaemoglobin dissociation curve to the right
What causes the Bohr Shift?
Increase in acidity, CO2 and temperature of blood
What does high affinity from haemoglobin to oxygen mean?
Holds on to oxygen
What does low affinity from haemoglobin to oxygen mean?
Lets go of oxygen
