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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.
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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
Species richness increases with island size.
Indicator and umbrella species.
The human embryo
Structure of the human b2-adrenergic receptor
Examples of Human Disorders Caused by Single-Gene Mutations
Human Thyroid and Parathyroid Glands