White blood cells (WBCs) are the foot soldiers of the immune system. They help fight infections, limit injury from other harmful substances, and initiate healing if tissue damage occurs. WBCs are made and primarily stored in the bone marrow.

Neutrophils are a type of white blood cell that your body uses to fight infections. High neutrophil levels are often caused by an infection, but other medical conditions and certain drugs can cause them as well. Physical or mental stress, and even smoking, can also increase neutrophil levels.

Boils, also referred to as abscesses, occur when bacteria invade a break in the skin, a blocked oil gland or hair follicle. White blood cells rush to the site to battle the bacteria, causing blood and pus to collect as an abscess deep within the skin.

Following a special diet can aid in the treatment of a number of chronic diseases, such as diabetes and heart disease. Polycythemia is a rare blood disorder that causes your body to over produce red blood cells, white blood cells and platelets.

T cells, also known as T lymphocytes, are a white blood cell of grave importance to your immune system; they allow your body to adapt a response to any pathogen.

The teeth are hard calcified structures that play a role in eating, speech and communication.

Ligaments are dense fibrous connective tissues that join bones. Ligaments occur throughout the body wherever there are joints, and they can be very complex.