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Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

Concept map of disease and immune system Concept map of disease and immune system
French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
The concept of a threshold stimulus. The concept of a threshold stimulus.
Illustration of the concept of overlapping genes Illustration of the concept of overlapping genes
Cast of a Fossil Dunkleosteus, with a human to illustrate scale Cast of a Fossil Dunkleosteus, with a human to illustrate scale
Video: Protein Secondary and Tertiary Structures - Animation

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