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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 human body produces and destroys 15 million blood cells every second.
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.
The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.