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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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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.

The levels of biological organization The levels of biological organization
This chart illustrates the four quadrants in which we can place the relationships between the state This chart illustrates the four quadrants in which we can place the relationships between the state
Young adulthood brings the greatest number of role transitions and highest levels of demands than ... Young adulthood brings the greatest number of role transitions and highest levels of demands than ...
How to use the closed interval method to find absolute maximum and minimum values How to use the closed interval method to find absolute maximum and minimum values
Differences in yield between two wheat varieties at different soil fertility levels Differences in yield between two wheat varieties at different soil fertility levels
Animated Changes in the ovary and uterus correlated with changing hormone levels. We start with the Animated Changes in the ovary and uterus correlated with changing hormone levels. We start with the
Video: Double Vacuum Process (Illustration No Audio)

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