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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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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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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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Orientation and structure of a nephron, the functional unit of the kidney. Orientation and structure of a nephron, the functional unit of the kidney.
Orientation and structure of a nephron, the functional unit of the kidney. Orientation and structure of a nephron, the functional unit of the kidney.
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