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Did you know?

There are more sensory neurons in the tongue than in any other part of the body.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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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.

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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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Video: Barriers - eye structures, digestive mucosa, respiratory mucosa & genitourinary mucosa

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