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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

A diversity of species live within the soils, the ecology of which remains to be explored. A diversity of species live within the soils, the ecology of which remains to be explored.
Cross Section of the Human Brain Cross Section of the Human Brain
Human Cell Anatomy Human Cell Anatomy
Major cell types in the human body. Major cell types in the human body.
Human photopic (cone) and scotopic (rod) spectral sensitivity curves. The peak of each curve has ... Human photopic (cone) and scotopic (rod) spectral sensitivity curves. The peak of each curve has ...
The human heart The human heart
Video: Nervous pathway to the Neuromuscular (NMJ)

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