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Science » Life Sciences » Diseases

National Heart, Lung, and Blood Institute's Diseases and Conditions Index

provides information about heart, lung, and blood diseases and sleep disorders. Learn how the heart works. Find out about aneurysms, angioplasty, electrocardiograms, heart attacks, high blood pressure, asthma, cystic fibrosis, sickle cell anemia, insomnia, narcolepsy, and more. (National Heart, Lung, and Blood Institute, National Institutes of Health)

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Interesting Fact:

Narcolepsy is a disorder that causes a person to have difficulty staying awake. Narcolepsy can cause a person to suddenly fall asleep during the day. These "sleep attacks" occur even after getting enough sleep at night. The unusual sleep pattern that people with narcolepsy have can affect their schooling, work, and social life.
This animation below shows how the heart's electrical system works.

The heart's electrical system

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