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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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There are 20 feet of blood vessels in each square inch of human skin.
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The average adult has about 21 square feet of skin.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.