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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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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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
MODERN BIOLOGY
Branches of biology
The primary and secondary adaptive responses.
Primary Recovery of Oil
Environmental Biology Vector Icon
Satellite data showing net primary production. Productivity is coded as red (highest) down through o