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

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Winter distribution of the American crow, Corvus brachyrynchos. Winter distribution of the American crow, Corvus brachyrynchos.
Prevalence and Sex Distribution of Top 10 Autoimmune Diseases Diagnosed in the United States Prevalence and Sex Distribution of Top 10 Autoimmune Diseases Diagnosed in the United States
Blood Distribution Blood Distribution
Distribution of F1 and F2 Progeny Derived from a Theoretical Cross Involving Tomatoes Distribution of F1 and F2 Progeny Derived from a Theoretical Cross Involving Tomatoes
A bell-shaped, or “normal,” curve shows the distribution of phenotypes for traits controlled by ... A bell-shaped, or “normal,” curve shows the distribution of phenotypes for traits controlled by ...
Clumped distribution of schooling squirrelfish Clumped distribution of schooling squirrelfish
Video: Cellular slime mold life cycle Animation

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