|
|
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Did you know?
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).
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.