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Cholesterol in the Blood Facts about cholesterol Cholesterol is a fat-like, waxy substance that can be found in all parts of your body. It helps your body make cell membranes, many hormones, and vitamin D. The cholesterol in your blood comes from 2 sources: the foods you eat and

Anatomy of the Breasts Each breast has 15 to 20 sections, called lobes. They are arranged like the petals of a daisy. Each lobe has many smaller structures called lobules. These end in dozens of tiny bulbs that can make milk. The lobes, lobules, and bulbs are all linked by thin

Molds in the Environment What is mold? A mold is a microscopic fungus that grows and lives on plant or animal matter. It can also live on nonorganic objects. Most molds are made up of filaments. They reproduce through the production of spores. Spores spread by air, water, or

Overview of the Male Anatomy This is an overview of the male reproductive anatomy: Scrotum. The bag of skin that holds and helps to protect the testicles. The testicles make sperm. To do this, the temperature of the testicles needs to be cooler than the inside of the body. This

Anatomy of the Endocrine System The endocrine system is a complex network of glands and organs. It uses hormones to control and coordinate your body's metabolism, energy level, reproduction, growth and development, and response to injury, stress, and mood. The following are key

Making the Home Environment Safe What's involved in making the home environment safe? When caring at home for an ill, aging, or disabled person of any age, it's important to think about home safety. Print out this helpful checklist. Then use it to check for safety issues around

Anatomy of the Prostate Gland Facts about the prostate gland The prostate gland is about the size of a walnut. It's located just below the bladder, and it surrounds the urethra. This is a tube that carries urine and semen out of the body. The prostate is partly muscular and

About the Heart and Blood Vessels The heart is the hardest working muscle in the human body. Located almost in the center of the chest, a healthy adult heart is the size of a clenched adult fist. By age 70, the human heart will beat more than 2.5 billion times. The heart is

Preventing Eye Strain at the Computer If you spend hours each day working at a computer screen or other devices with screens, you may suffer from symptoms of eye strain. Eye strain is a common problem, but you can take steps to reduce your discomfort. What is eye strain? Eye

Cystic Fibrosis and the Digestive System How does CF affect the digestive system? Children with cystic fibrosis (CF) have a protein in their cells that doesn't work right. The protein is called CFTR (the cystic fibrosis transmembrane regulator). CFTR controls the flow of water