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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t Glaucoma. (a) A buildup of pressure within the eye cavities, often caused by a blockage of vessels t
Nerve Cell Nerve Cell
Cross Section of Skin and Free Nerve Endings Cross Section of Skin and Free Nerve Endings
Using Controls to Monitor Results Using Controls to Monitor Results
Branches of a Spinal Nerve Branches of a Spinal Nerve
Sagittal view of the olfaction (Sense of Smell) Sagittal view of the olfaction (Sense of Smell)
Video: Electrical Conduction System of the Heart

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