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Did you know?

About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Blank cell diagram Blank cell diagram
HIV cycle in an infected cell: (a) latent infection; (b) active infection. HIV cycle in an infected cell: (a) latent infection; (b) active infection.
Schematic drawing of a rod cell Schematic drawing of a rod cell
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
The epigenetic stem cell model proposes that both epigenetic changes The epigenetic stem cell model proposes that both epigenetic changes
Cytotoxic T Cell Killing a Cancer Cell Cytotoxic T Cell Killing a Cancer Cell
Video: Structures that affect circulation - arterioles and vasomotor responses and venous return

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