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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
The evolution of an endemic island species from a mainland species.
Regions of the Human Visual Cortex and Their Functions
Organ systems of the human body.
Mechanism of Respiration in Human
Trace Elements of the Human Body
Zone dimensions are not drawn to scale.