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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

Louis Comfort Tiffany, Tiffany Studios, Water-lily table lamp. Louis Comfort Tiffany, Tiffany Studios, Water-lily table lamp.
skeletal muscle consists of a group of fibers held together by connective tissue. It is enclosed in ... skeletal muscle consists of a group of fibers held together by connective tissue. It is enclosed in ...
A typical malfunction indicator lamp (MIL) often labeled “check engine.” A typical malfunction indicator lamp (MIL) often labeled “check engine.”
A wrench symbol warning lamp on a Ford vehicle. The symbol can also be green. A wrench symbol warning lamp on a Ford vehicle. The symbol can also be green.
Gene expression consists of transcription of DNA into mRNA Gene expression consists of transcription of DNA into mRNA
The eukaryotic cell cycle consists of two parts: (1) interphase and (2) mitosis followed by cytokine The eukaryotic cell cycle consists of two parts: (1) interphase and (2) mitosis followed by cytokine
Video: Congenital Heart Defects Animation

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