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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Local and long–distance cell communication in animals. Local and long–distance cell communication in animals.
The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland. The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland.
Two main types of nerve cells. Two main types of nerve cells.
biology 30 cell biology 30 cell
The cell wall of a Gram-positive bacterium, S. aureus The cell wall of a Gram-positive bacterium, S. aureus
VIEW OF A MONK'S CELL IN THE MONASTERY OF SAN MARCO, FLORENCE VIEW OF A MONK'S CELL IN THE MONASTERY OF SAN MARCO, FLORENCE
Video: Mendel's pea plant, Pisum sativum experimental

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