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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Descartes’ Theory Descartes’ Theory
Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that
When the IQ scores of identical twins differ, behavior genetics researchers attribute these to ... When the IQ scores of identical twins differ, behavior genetics researchers attribute these to ...
The clonal selection theory of the adaptive immune response The clonal selection theory of the adaptive immune response
The Nebular Theory The Nebular Theory
Frederick Griffith’s experiment identifying a ″transformation factor″ responsible for heredity Frederick Griffith’s experiment identifying a ″transformation factor″ responsible for heredity
Video: Complement Proteins Animation

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