Shingles is an illness caused by infection with the varicella-zoster virus. Varicella is the same virus that causes chickenpox. After a person has had chickenpox, the virus can remain inactive in the nerve tissue for many years. Stress, agi...
Inside the hollow area of the bones is a spongy core called bone marrow. It is here, that stem cells are produced. Stem cells are immature cells that can develop into components of blood: red blood cells, which carry oxygen to the body; ...
The female reproductive system includes the uterus, fallopian tubes, and ovaries. The ovaries are almond-shaped glands located on either side of the uterus. They produce the sex hormones estrogen and progesterone, which regulate a woman’s ...
The lymphatic system is part of the body’s immune system, which is responsible for keeping the body free of disease. The lymph nodes throughout the body are connected by a network of lymph vessels. Lymph is a fluid found within the lympha...
The female breast is primarily composed of fatty tissue and mammary glands. Mammary glands drain into the lactiferous sinus, which connects them to the nipple. During pregnancy, mammary glands swell in order to accommodate milk production. ...
During the digestive process, much of the food that is eaten is converted into glucose, commonly known as blood sugar. Glucose circulates in the bloodstream and is used as food for the body's cells. But the cells cannot absorb glucose alone...
An allergy occurs when the body reacts to substances it can't tolerate. The substances, like tree pollen or dust mites, are called environmental antigens, or allergens, and are normally harmless. But the immune system of a person with aller...
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