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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.