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Vaccines prevent between 2.5 and 4 million deaths every year.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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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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Excessive alcohol use costs the country approximately $235 billion every year.

Invasive species provide an example of predator pressure. Invasive species provide an example of predator pressure.
The human heart The human heart
The base of the human cranium is more flexed than the base of the chimpanzee cranium. The base of the human cranium is more flexed than the base of the chimpanzee cranium.
Neoteny in Evolution of the Human Skull Neoteny in Evolution of the Human Skull
A single cell from an early-stage human embryo A single cell from an early-stage human embryo
Cladogram showing genetic distances and relationships between human populations Cladogram showing genetic distances and relationships between human populations
Video: Structures that affect circulation - venous return

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