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Effacement (thinning) As labor nears, the fetus's head drops down into the pelvis and pushes against the cervix. The cervix begins

The heart has four chambers. The two upper chambers are called atria (the right atrium and the left atrium), and the two lower

Find the compression landmark. Kneel next to the person. Use your fingers to locate the end of the person's breastbone, where the

Adapted from: U.S. National Heart, Lung and Blood Institute; U.S. National Institutes of Health (2000). The Practical Guide

Normally the testicles, which form inside the abdomen of a male fetus, descend into the sac beneath the penis (scrotum) by the

Most hives (urticaria) are an allergic skin reaction that appears as raised, red, itchy bumps of different shapes and sizes

An allergic reaction to medicine can cause hives. They appear as raised, red, itchy bumps (wheals) of different shapes and sizes

Source: Public Health Image Library (PHIL). Available online: http://phil.cdc.gov Brown recluse spiders ( Loxosceles reclusa )

Scorpions, found mostly across the southern and western United States, are up to 3 in. (7.6 cm) in length. They have eight legs

Source: Public Health Image Library (PHIL). Richard F. Darsie Jr., PhD. Available online: http://phil.cdc.gov The puss caterpillar