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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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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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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

digestive system digestive system
Medical assistant uses a laptop computer for bedside charting. Medical assistant uses a laptop computer for bedside charting.
The nervous system. The nervous system.
Disorders of the Urinary System Disorders of the Urinary System
A general model of the sensorimotor system. Notice its hierarchical structure, functional ... A general model of the sensorimotor system. Notice its hierarchical structure, functional ...
A fibrous root system has similar-sized adventitious roots that branch from the stem A fibrous root system has similar-sized adventitious roots that branch from the stem
Video: Double Stranded DNA Molecule Animation

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