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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
![USF Biologist Taegan McMahon conducts experiments on chlorothalonil at a research facility in East H](https://biology-forums.com/gallery/47/medium_12359_16_05_12_9_06_07.jpeg)
![Peripheral veins used in intravenous therapy; A, forearm; B, dorsum of the hand; C, dorsal plexus of](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_30_04.jpeg)