Test 3: Wk11: 7.1 Gas Transport and Diffusion - Dasgupta Flashcards
there is a direct correlation between the partial pressure of gasses and
the concentration of gasses
0.3 % Vol O2 in plasma = PaO2 100 mmHg
then 0.6% Vol O2 in plasma =
200 mmHg
O2 is carried in what two forms in the blood
dissolved in plasma and bound to hemoglobin
O2 solubility
very insoluble
amount of O2 dissolved in arterial blood in lungs
0.3 ml O2 /100ml
3 ml O2 / L
0.3 vol %
partial pressure of oxygen is due to dissolved oxygen in plasma not
oxygen bound to hemoglobin
each molecule of Hb binds to — molecules of O2
4
majority of O2 in blood is bound to
Hb
O2 available to tissues is through
dissolved O2
Hb is a — for oxygen
buffer/ reservoir
Capillary PO2 deoxygenated
40 mmHg
gasses move
down partial pressure gradients
O2 dissociates from – and goes into solution in plasma
Hb
Dissolved gas diffuses — into interstitial space
down partial pressure gradient
PO2 in arterial blood
100 mmHg
Hb saturation arterial blood
97.4 %
PO2 in venous blood
40 mmHg
Hb saturation venous blood
75%