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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

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Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Cytoplasmic response to a signal: the stimulation of glycogen breakdown by epinephrine. Cytoplasmic response to a signal: the stimulation of glycogen breakdown by epinephrine.
Concept map of disease and immune system Concept map of disease and immune system
Parts of human nervous system Parts of human nervous system
Overview of the cardiovascular system. Overview of the cardiovascular system.
Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ... Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ...
Complete Digestive System: Bird Complete Digestive System: Bird
Video: Role of ATP in muscle movement

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