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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Ribosome structure Ribosome structure
Levels of protein structure: Secondary structure Levels of protein structure: Secondary structure
Structure of the g complex bound to DNA Structure of the g complex bound to DNA
Structure of a processed mRNA 5’ end Structure of a processed mRNA 5’ end
Structure of a skeletal muscle. Structure of a skeletal muscle.
Structure of a woody stem (comparison) Structure of a woody stem (comparison)
Video: Baroreceptor Reflex

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