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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 human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

The human forebrain. The human forebrain.
Phenotypic and molecular markers mapped on human chromosome 1 Phenotypic and molecular markers mapped on human chromosome 1
Temperature Ranges for Human Survival Temperature Ranges for Human Survival
Human dihydrofolate reductase complexed with ligands Human dihydrofolate reductase complexed with ligands
Bones of the human skeleton Bones of the human skeleton
Stages of Human Development Stages of Human Development
Video: Structures that affect circulation - heart and MABP

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