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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
The familiar sounds of your heart are made by the heart's valves as they open and close.