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Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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Video: Barriers - eye structures, digestive mucosa, respiratory mucosa & genitourinary mucosa

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