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Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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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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There are more sensory neurons in the tongue than in any other part of the body.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Conduction system of the heart. Conduction system of the heart.
Classification of Ismchmic heart disease Classification of Ismchmic heart disease
Desmosomes and gap junctions, as shown in heart muscle: Gap junctions Desmosomes and gap junctions, as shown in heart muscle: Gap junctions
Normal conduction pathway in the heart. Normal conduction pathway in the heart.
Structural components of the heart Structural components of the heart
Normal conduction pathway in the heart Normal conduction pathway in the heart
Video: Mechanisms of capillary exchange

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