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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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The average adult has about 21 square feet of skin.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Replica of an Asian elephant's molar, showing upper side. Replica of an Asian elephant's molar, showing upper side.
Alzheimer’s medications work by intensifying the effect of acetylcholine at the receptor. Alzheimer’s medications work by intensifying the effect of acetylcholine at the receptor.
The primary factors affecting blood pressure. The primary factors affecting blood pressure.
Effect of pH on drug absorption. (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ... Effect of pH on drug absorption. (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ...
Mechanism of action of anti-parkinson drugs. (a) Levodopa therapy increases dopamine production; (b) ... Mechanism of action of anti-parkinson drugs. (a) Levodopa therapy increases dopamine production; (b) ...
Standing at the side and facing the head, apply shingles effleurage to paraspinal muscles of the ... Standing at the side and facing the head, apply shingles effleurage to paraspinal muscles of the ...
Video: Introduction to Heart Attacks

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