The body's defense against infections

it works by protecting the body from foreign illness and sicknesses and helps keep the body safe.

B-cells recognize and produce antibodies, T-cells recognize and destroy antigens.

AIDS weakens the immune system and by doing so one can get sick easier and when sick can be sick for a longer period of time.

The upper or outer layer of the two main layers of cells that make up the skin.

specific and nonspecific

They help defend the body once the illness and germs are inside the body.

First line is the basics and most of the time kill the germs, the second line helps keeps the germs from spreading once past the first line and the third line is for a really bad illness because most germs don't make it that far.

People with sickle cell disease have weakened immune systems and are at increased risk for developing infection, especially in the lungs, kidneys, bones, and central nervous system.

The pigment that gives human skin, hair, and eyes their color.

Skin, Saliva, Cilia, Mucus and Stomach Acid

They are proteins that latch onto, damage, clump, and slow foreign particles.

Nonspecific response come into play immediately or within hours of an antigen's appearance in the body. Specific response creates immunological memory after an initial response to a specific pathogen, and leads to an enhanced response to subsequent encounters with that pathogen.

The immune system "misfires" and inappropriately causes inflammation and an accelerated growth of skin cells.

Any of various body fluids resembling serum, that are typically pale yellow and transparent and of a benign nature.

White Blood Cells and Interferons

Recognize antigens, proliferate and produce specific antibodies.

Active immunity is when you produce the antibodies.
Passive immunity is when you don’t produce the antibodies.

The combination of inflammation and ulceration can cause abdominal discomfort and frequent emptying of the colon. Ulcerative colitis is the result of an abnormal response by your body's immune system. Normally, the cells and proteins that make up the immune system protect you from infection, but in this case they harm your body.

One of a family of fibrous structural proteins. It is the key structural material making up hair, nails, horns, claws, hooves, and the outer layer of human skin.

Antibodies

Recognize and destroy tagged antigens and proliferate.

Phagocytes are responsible for eating foreign particles by engulfing them. T-cells are the natural killers that recognize the infections and cancer cells.

When a harmless substance such as dust, mold, or pollen is encountered by a person who is allergic to that substance, the immune system may over react by producing antibodies that "attack" the allergen. The can cause wheezing, itching, runny nose, watery or itchy eyes, and other symptoms.

Skin