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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
Changing leaf area: (a) following rainfall ocotillo plants of the Sonoran Desert develop leaves and
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Firing Patterns of a Supplementary Motor Area Neuron
The lymph node structure.
Hand position for the cradle. Overlap the last three fingers of your left hand on the last three ...
Didinium, a barrel-shaped ciliate with tufts of cilia, catching (left) and engulfing (right) Paramec