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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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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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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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There are approximately 3 million unintended pregnancies in the United States each year.

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Cyanide works by making the human body unable to use oxygen.

Successful biological control of leafy spurge. Successful biological control of leafy spurge.
A chuckwalla, Sauromalus ater. Chuckwallas are large herbivorous lizards living in the southwestern A chuckwalla, Sauromalus ater. Chuckwallas are large herbivorous lizards living in the southwestern
Small and large intestines Small and large intestines
graphic(04-40.jpg) Mary pushes horizontally on a large, heavy table which is s graphic(04-40.jpg) Mary pushes horizontally on a large, heavy table which is s
Genetic Drift in Large and Small Populations Genetic Drift in Large and Small Populations
The frequency distribution of the allele in Africa, Southern Europe, the Middle East The frequency distribution of the allele in Africa, Southern Europe, the Middle East
Video: Primary Active Transport - electrochemical gradient and ion transport / water movement

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