The anus and external and internal sex organs of both men and women.
A type of protein produced by the body's immune system. Antibodies respond to antigens by binding to them. This process results in the elimination of the antigens or infected human cells.
Any foreign substance that when introduced into the body stimulates an immune response.
The bottom-most layer of epithelium.
A disease caused by the uncontrolled division of abnormal cells in the body.
The fundamental microscopic unit that is the building block of all living things except viruses.
When cells divide and duplicate.
DNA (deoxyribonucleic acid)
A molecule found in almost every cell that contains an organism's genetic code. DNA is made of two strings of bases wound in a helix, or spiral, shape.
Epithelial cells make up the tissue that covers the outside of the body and lines internal cavities. Tissue made of layers of epithelial cells is called the epithelium.
The scientific theory for how groups of living things change over time.
The scientific study of heredity. Also, the genetic constitution of an individual, group, or class.
An organism that provides food or shelter for another organism.
See human papillomaviruses
human papillomaviruses (HPV)
A family of viruses that infects the body's epithelial cells. They are called papillomaviruses because they can cause noncancerous tumors called papillomas, otherwise known as warts.
The components of the body that prevent and fight disease.
The mouth, tongue, and throat region.
Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen and usually sulfur, the characteristic element being nitrogen; widely distributed in plants and animals.
The emission of energy by waves (including light) or particles.
A medical treatment that uses antibodies produced in a laboratory to deliver lethal radiation to target cells in the body.
Reproduction or duplication.
sexually transmitted disease (STD)
A communicable disease transmitted by sexual intercourse or genital contact.
A substance that contains antigenic components, either weakened, dead or synthetic, from an infectious organism which is used to produce active immunity against that organism.
An ultramicroscopic infectious agent that replicates itself only within cells of living hosts.