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Fibrillation is a type of abnormal muscle contraction. A fibrillating heart muscle looks as if it is wiggling rather than squeezing and does not move blood the way a normal contraction does. This video discusses what happens when the fibrillation is in the atrium, one of the upper chambers of the heart.
True or false: Head lice travel from one person's head to another's by jumping. Check out this and other answers to true-false questions about head lice.
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Ovarian cancer can develop in one of three types—the first, on the surface of the ovary; the second, in the cells that form the eggs; the third, in the cells that produce female hormones. More