The entire blood calcium is confined to plasma since erythrocyte membrane is impermeable to calcium ions. The plasma calcium whose total content is 9-11mg/100 ml, in three different forms.
a) Ionized-which is diffusible through membrane and capillary wall
b) Non ionized protein bound-which is combined with plasma proteins and not pass through the capillary wall
c) Non-ionized-complexed-which forms complex with citrates,bicarbonates and phosphate ions, but still is capable of passing through the capillary wall.
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Cooling curves-
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