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Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood

Your Child's Allergies: Dust Mites What is a dust mite? Dust mites are microscopic organisms that live in homes and schools. They like warm, humid areas filled with dust. Dust mites feed on the shed scales of human skin that work their way into furniture, carpets, bedding, and

Screening Tests for Common Diseases What is a screening test? A screening test is done to find possible health problems or diseases in people who don't have any symptoms of disease. The goal is to find a problem early enough to lower the risk for the disease . Or to find it early

Evaluation Procedures for Orthopedic Problems What are standard evaluation procedures? Before a treatment or rehabilitation plan can be made, your orthopedist must first find what is causing your condition. This typically involves a physical exam and a review of your health