Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
Fertilization of an egg by a sperm.
Sperm in the fallopian tube.
Tertiary structure of sperm whale myoglobin
An old concept of genetic transmission—a homunculus in a sperm cell.