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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Negative feedback as a mechanism by which homeostatic control systems operate. Negative feedback as a mechanism by which homeostatic control systems operate.
Feedforward control of breathing rate in an animal trained for athletic exercise. Feedforward control of breathing rate in an animal trained for athletic exercise.
Bottom-up control versus top-down control. Bottom-up control versus top-down control.
Internal acoustic meatus Internal acoustic meatus
Model for control of cytoplasmic polyadenylation and translation initiation Model for control of cytoplasmic polyadenylation and translation initiation
Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ... Schematic of a typical electronic throttle control (ETC) system. Note that terminal #5 is always ...
Video: Carpal Tunnel Syndrome

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