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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Common arachnids. Common arachnids.
Anatomical and common names for the pelvic girdle and lower extremity. Anatomical and common names for the pelvic girdle and lower extremity.
Peptic ulcer. A peptic ulcer may occur in the stomach (gastric ulcer), as shown here, or in the duod Peptic ulcer. A peptic ulcer may occur in the stomach (gastric ulcer), as shown here, or in the duod
A child suffering from malaria, one of the most common and deadly infectious diseases. A child suffering from malaria, one of the most common and deadly infectious diseases.
The nucleotide cyclic AMP (cAMP), a common messenger molecule. The nucleotide cyclic AMP (cAMP), a common messenger molecule.
Muscle Tissue Components Muscle Tissue Components
Video: HIV Infection: Viral life cycle

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