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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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.
A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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.
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
![Two wells are filled with different antigens and when they diffuse, they form lines that cross which ...](https://biology-forums.com/gallery/31/medium_398119_11_07_17_6_30_42_31543144.jpeg)
![Two wells are filled with related or partially identical antigens. The well on the left contains an ...](https://biology-forums.com/gallery/31/medium_398119_11_07_17_6_30_43_31544472.jpeg)