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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.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

The cellular response of skeletal muscle cells to epinephrine The cellular response of skeletal muscle cells to epinephrine
The effects of epinephrine in humans The effects of epinephrine in humans
Synthesis of the amine hormones dopamine, norepinephrine, and epinephrine. Synthesis of the amine hormones dopamine, norepinephrine, and epinephrine.
Cytoplasmic response to a signal: the stimulation of glycogen breakdown by epinephrine. Cytoplasmic response to a signal: the stimulation of glycogen breakdown by epinephrine.
Primary Action of Epinephrine in a Liver Cell Primary Action of Epinephrine in a Liver Cell
Biosynthesis of the catecholamines—dopamine, norepinephrine, and epinephrine Biosynthesis of the catecholamines—dopamine, norepinephrine, and epinephrine
Video: Cerebral Cortex Animation

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