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The familiar sounds of your heart are made by the heart's valves as they open and close.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.
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.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).