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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

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The FDA recognizes 118 routes of administration.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Malpighian tubules from the excretory system of an insect. Malpighian tubules from the excretory system of an insect.
The Major Divisions of the Nervous System The Major Divisions of the Nervous System
The Autonomic Nervous System The Autonomic Nervous System
The digestive system. The digestive system.
Agriculture is responsible for as much as 15% of global greenhouse gas emissions Agriculture is responsible for as much as 15% of global greenhouse gas emissions
Internal organs of the female reproductive system within the pelvis Internal organs of the female reproductive system within the pelvis
Video: Causes of Angina

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