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Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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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.

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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Video: Phases of an Action Potential - Resting Potential, Threshold, Rising, Falling, & Recovery Phases

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