Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Thyroid conditions may make getting pregnant impossible.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Examples of different cell types in humans
Structures of a typical cell.
The bacterial cell wall: (a) gram-positive bacterium; (b) gram-negative bacterium.
Summary of T-Cell Types
VIEW OF A MONK'S CELL IN THE MONASTERY OF SAN MARCO, FLORENCE