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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?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
In 1864, the first barbiturate (barbituric acid) was synthesized.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.