Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The human body produces and destroys 15 million blood cells every second.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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People about to have surgery must tell their health care providers about all supplements they take.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
A hypothetical model of the process of cell-wall expansion.