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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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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.

The cardiovascular system. A schematic view of the closed circulation of blood. The heart is section The cardiovascular system. A schematic view of the closed circulation of blood. The heart is section
ABO Blood Typing ABO Blood Typing
Blood Flow Through the Cardiorespiratory System Blood Flow Through the Cardiorespiratory System
Flow scattergrams showing results on the top set from a healthy donor and on the bottom set from a ... Flow scattergrams showing results on the top set from a healthy donor and on the bottom set from a ...
Blood tissue Blood tissue
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