Everyone is born with an immune system. It consists of a team of cells, proteins, tissues and organs that fight off illness, germs and other invaders. When an unsafe substance enters the body, the immune system kicks into gear and attacks. In a baby's first few months, her immune system is not fully developed.

The urinary system is comprised of the kidneys, ureters and bladder as well as sphincter muscles and the urethra.

Antibodies are critical to your immune system's function. These cells are present in the body to ward off illnesses, including viruses and bacteria, and the more you have, generally, the healthier you will be.

Excessive alcohol can damage the immune system because the alcohol will prevent nutrients from feeding your immune system. The alcohol is absorbed into your bloodstream through your stomach. Once in the bloodstream, alcohol will reduce the white blood cell count in the body.

Immunosuppressive drugs can cause depression of the body's natural defense system, resulting in increased risks of infections and illnesses. Common immunosuppressive medications include corticosteroids and prednisone.

Millions of people suffer from allergies. The triggers for an allergy attack are as various as the symptoms. A tingling sensation in the face might be the result of an allergic reaction. On the other hand, facial tingling might indicate a more serious medication condition. Your doctor can make the proper determination.

White blood cells are infection-fighting cells produced in the bone marrow. When a type of white blood cell called a neutrophil is lowered in the body -- a condition called neutropenia -- the immune system is weakened and a person becomes vulnerable to infections.

The immune system is responsible for keeping the body healthy and protecting against sicknesses and infections. When someone has a poor immune system, due to a disease such as AIDS or cancer, they are more likely to get sick easily.

Toxins and free radicals can build up in your body, causing cellular damage and illness. Diet and exposure to environmental toxins can damage the mitochondria in your cells — vital microorganisms that help convert food to energy.

The dome-shaped cornea covers your eye. The space between the cornea and your iris contains fluid called aqueous humor that nourishes the surrounding tissues. If you have thin corneas, you may have an increased risk for corneal damage or misdiagnosis of eye conditions.

Cordyceps is a medicinal fungus, or mushroom, (See Ref 1) with a long history of use in Traditional Chinese Medicine. People take it for a variety of purposes, including to promote healthy blood sugar levels, reduce fatigue and for anti-aging.

Free radicals are dangerous molecules that can accumulate in your body and cause serious health problems, like cancer. According to the National Cancer Institute, free radicals are formed with incomplete electron shells, which makes them more chemically reactive and damaging to your health.