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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.