There are more nerve cells in one human brain than there are stars in the Milky Way.
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Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.
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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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.
Heart Anatomy Model
The conduction system of the heart; traces the path of the electrical impulse that stimulates the he
HEART
Human Heart
Diagram of the heart showing normal conduction pathway.