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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.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
The longest a person has survived after a heart transplant is 24 years.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.