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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.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
![Apply effleurage to the face using palms. Stroke bilaterally from chin to temples, lifting facial ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_13_04_331291685.jpeg)
![Apply passive touch over abdomen to finish. Slow the circle stroke you performed in Step 14, and let ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_5_31_00_33218959.jpeg)