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)
