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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

A model of anxiety in which stressful events or a changing mental condition can produce unfavorable A model of anxiety in which stressful events or a changing mental condition can produce unfavorable
Children with disabilities used to be sent to special schools. In a process called mainstreaming or ... Children with disabilities used to be sent to special schools. In a process called mainstreaming or ...
Marx's Model of Historical Change Marx's Model of Historical Change
A model for the RuvA-RuvB-Holliday junction structure A model for the RuvA-RuvB-Holliday junction structure
The Steady State of the Solow Model The Steady State of the Solow Model
A model of the splicing mechanism for removal of an intron from nuclear-derived pre-mRNA A model of the splicing mechanism for removal of an intron from nuclear-derived pre-mRNA
Video: Metaphase I Animation

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