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Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
The human body produces and destroys 15 million blood cells every second.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.