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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort Endocarditis. The human heart has been sectioned to reveal the left ventricle and origin of the aort
Herniated disk. A herniated disk is a protrusion of the disk’s gelatinous center, called the nucleus Herniated disk. A herniated disk is a protrusion of the disk’s gelatinous center, called the nucleus
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve
Some ignition coils are electrically connected, called married (top figure), whereas others use ... Some ignition coils are electrically connected, called married (top figure), whereas others use ...
A thin cleft, called the synapse, separates one cell from another. A thin cleft, called the synapse, separates one cell from another.
Video: Red Blood Cells - Erythropoietin (EPO)

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