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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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The human body produces and destroys 15 million blood cells every second.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

The three basic body plans of bilaterally symmetrical animals. The three basic body plans of bilaterally symmetrical animals.
Traditional animal phylogeny based on body plans. Traditional animal phylogeny based on body plans.
Preparing a Urine Specimen for Microscopic Examination (for Classroom Evaluation Only) Preparing a Urine Specimen for Microscopic Examination (for Classroom Evaluation Only)
Selective pressures from the environment influence adaptation Selective pressures from the environment influence adaptation
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A sample of work by a Grade 4 student with a specific learning disorder A sample of work by a Grade 4 student with a specific learning disorder
Video: Mechanisms for chromosome movement Animation

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