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Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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

Hormone and Hormone Antagonists Used for Neoplasia Hormone and Hormone Antagonists Used for Neoplasia
Localization of a Peptide The peptide is revealed by means of immunocytochemistry. The photomicrogra Localization of a Peptide The peptide is revealed by means of immunocytochemistry. The photomicrogra
Neurotransmitter synthesis, action, and degradation at cholinergic synapses. Neurotransmitter synthesis, action, and degradation at cholinergic synapses.
An example of feedback regulation of a hormone An example of feedback regulation of a hormone
Steroid hormone receptors Steroid hormone receptors
Control of Hormone Secretion Control of Hormone Secretion
Video: Cleavage and Implantation Animation

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