New Zealanders' blood donations help 29,000 people each year (or 76 jumbo jets full of people)
Plasma, which is 90% water, constitutes about 55% of blood volume. Plasma contains:
Plasma serves a variety of functions, from maintaining a satisfactory blood pressure and volume to supplying critical proteins for blood clotting and immunity. It also serves as the medium of exchange for vital minerals such as sodium and potassium.
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