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Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Blank cell diagram Blank cell diagram
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
Bio worksheet Bio worksheet
The ras proto-oncogene encodes a signal-transduction protein that processes signals for cell divisio The ras proto-oncogene encodes a signal-transduction protein that processes signals for cell divisio
cell organelles cell organelles
The response of the lac operon in the presence of lactose in a cell bearing the IS mutation The response of the lac operon in the presence of lactose in a cell bearing the IS mutation
Video: Cell mediated immune response to a viral infection Animation

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