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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

Encopresis What is encopresis? Encopresis is when your child leaks stool into their underwear. It's also called stool soiling. It's most often because of long-term (chronic) constipation. Encopresis happens to children ages 4 and older who have already been toilet trained. In

Preventing Obesity in Children, Teens, and Adults Facts about obesity Obesity is a long-term (chronic) disease. It affects growing numbers of children, teens, and adults. Obesity rates among children in the U.S. have doubled since 1980. They have tripled for teens. About 19 out

Actinic Keratosis What is actinic keratosis? Actinic keratosis (AK) is a rough, scaly spot or bump on sun-exposed skin. Most people with AK have more than one spot. AK is the most common precancer of the skin. Over time, it can develop into squamous cell skin cancer. Most

Anatomy of a Joint Joints are the areas where 2 or more bones meet. Most joints are mobile, allowing the bones to move. Joints consist of the following: Cartilage. This is a type of tissue that covers the surface of a bone at a joint. Cartilage helps reduce the friction of

Sunscreens: Protect Your Skin What are sunscreens? Sunscreens protect the skin. They play an important role in blocking ultraviolet (UV) radiation from being absorbed by the skin. UV radiation damages the skin and can lead to sunburns and skin cancer. No sunscreen blocks UV

Medical Genetics: Types of Genetic Changes The human body has about 20,000 different genes in each cell. Genes are located on chromosomes, which are stick-shaped structures in the middle of the cell (nucleus). Each cell usually has 46 chromosomes grouped in 23 pairs. Each gene