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transport of gases

02 and co2 transported in blood

02 transport

systemic arteries, plasma and Hb


oxy-Hb hb with 02 bound to it


deoxy-Hb hb wihout 02 bound to it

Hb binds

o2 at lungs, pulmonary capillaries.

Hb release

02 at tissue and systemic capillaries

affinity between hb and o2

varies, po2 changes the affinity of the Hb and o2 (strength of attraction)

high po2

high affinity Hb binds o2

low po2

low affinity hb releases o2

oxyhemoglobin dissociation curve

high saturation = high afinity and low saturation=low affinity

systemic arteries

98-99% saturated, high affinity

systemic veins

75% saturated lower affinity

systemic arteries

20 ml 02/ 100 ml blood.


very little o2 is dissolved 1-2%

hemoglobin (Hb)

98-99% of 02 is bound to it

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