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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Nerves can transmit many signals at the same time Nerves can transmit many signals at the same time
The 31 pairs of spinal nerves. The 31 pairs of spinal nerves.
The spinal cord. Although there are only seven cervical vertebrae, there are eight cervical spinal ... The spinal cord. Although there are only seven cervical vertebrae, there are eight cervical spinal ...
Three patterns of axonal regeneration in mammalian peripheral nerves. Three patterns of axonal regeneration in mammalian peripheral nerves.
Cross section of the wrist showing tendons and nerves involved in carpal tunnel syndrome. Cross section of the wrist showing tendons and nerves involved in carpal tunnel syndrome.
The Cervical Vertebrae: Right Lateral View of Vertebra The Cervical Vertebrae: Right Lateral View of Vertebra
Video: Role of the respiratory system - effect of altered ventilation rates

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