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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
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Pollen and Children What is pollen? Each grain of pollen is tiny (microscopic). When there is a lot of pollen together, it becomes a fine yellow powder. It's made of the male reproductive cells of flowering plants, trees, grasses, and weeds. It's the most common cause of hay
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Genetics and Immune Disorders Your immune system is made up of a large network of cells, tissues, and organs. They work together to fight off infections and other harmful substances. But the immune system doesn't always work the way it should. Some disorders make the immune
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Anemia and Chemotherapy Anemia is a potential side effect of chemotherapy (chemo). It's a condition that involves a decrease in the number of red blood cells (RBCs) in your body. These are the cells that carry oxygen to other cells all over your body. Chemotherapy can damage your
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Anatomy of the Eye Anterior chamber. The front section of the eye's interior where aqueous humor flows in and out, providing nourishment to the eye. Anterior chamber. The front section of the eye's interior where aqueous humor flows in and out, providing nourishment to the eye
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The Digestive System: An Overview What is digestion? Food and drink must be changed into smaller molecules of nutrients to be absorbed into the blood and carried to cells throughout the body. Digestion is the process by which food and liquid are broken down into smaller parts
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Tests to Diagnose a Stroke How is a stroke diagnosed? Your doctor will ask you about your health history. They will give you a physical exam. You may also have these tests to diagnose a stroke. Imaging tests of the brain CT scan. This test uses X-rays and a computer to make
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Sunscreens: Protect Your Skin What are sunscreens? Sunscreens protect the skin. They help block 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 radiation 100%. But they
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Benign Skin Growths in Children What are benign skin growths? Children may have many types of skin growths. The vast majority of growths in children are benign. This means they are not cancer. Growths may be caused by genetics, injuries, sun exposure, or other reasons. What are
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Anatomy and Function of the Urinary System How does the urinary system work? The body takes nutrients from food and changes them to energy. After the body has taken the food components that it needs, waste products are left behind in the bowel and in the blood. The kidney and