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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Blood is approximately twice as thick as water because of the cells and other components found in it.