Gas transport Flashcards
oxygen is present in which 2 forms in the blood
dissolved in blood and bound to hemoglobin
which type of blood vessels would be about 75% saturated with oxygen
veins
which type of blood vessels would be about 100% saturated with oxygen
arterial blood
Po2 is usually _____ (high/low) in pulmonary capillaries
Why is this?
high
so that there is less dissociation of the oxygen and that it stays within in the capillary
Po2 is usually _____ (high/low) in tissue capillaries
Why is this?
low
so that there is more dissociation of the oxygen into the tissue
define O2 capacity
The amt of O2 that can be combined with Hb depending on the sites available
define O2 saturation
% of available binding sites
define O2 content (concentration)
total O2 in the blood (02 capacity x O2 saturation) + concentration of dissolved O2
Why is cyanosis easier to see in people with polycythemia than people with anemia
polycythemia mean there might be a lotof RBC (Hb) so the amt of deoxygenated Hb will be greater and show more
Why is Mb able to store O2 for skeletal muscle
It has a high affinity for O2 so O2 from Hb leaves ad binds with it and it it harder to dissociate from the Mb
Three forms of CO2 in the blood
dissolved CO2
Carbamino compounds
Bicarbonate
Which enzyme is needed to make HCO3
carbonic anhydrase
The Haldane effect is more demonstrated in which tissues
Why is this?
lungs
because the Haldane effect is when an increase in Po2 leads to unloading of CO2 from Hb (can then be expired)
The Bohr effect is more demonstrated in which tissues
Why is this?
metabolizing tissues
because the Bohr effect is when an increase in Co2 and decrease in pH causes O2 to be dissociated from Hb (O2 can then be utilized by tissues)
