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The familiar sounds of your heart are made by the heart's valves as they open and close.

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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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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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