The Immune System
Name: ______________________ Date: ____________
Write the letter of the matching definition next to each term.
1. Immunity
A. The virus that causes acquired immune deficiency syndrome
2. Antigens
B. Tiny single-celled living things, some of which cause illness
3. Antibodies
C. The opening through which food is taken in and vocalizations emerge
4. B Cells
D. Any of a large variety of proteins normally present in the body or produced in response to (plural)
5. Allergy
E. The organ of smell and entrance to the respiratory tract
6. Tonsils
F. The condition in which an organism can resist disease
7. Nose
G. The abbreviation for acquired immunodeficiency syndrome, an advanced stage of HIV infection.
8. Mouth
H. Any disease-producing agent
9. Spleen
I. Any substance that stimulates an immune response in the body (plural)
10. AIDS
J. Either of two masses of lymphatic tissue one on each side of the oral pharynx (plural)
11. HIV
K. A lymphocyte derived from bone marrow that provides humoral immunity (plural)
12. Bacteria
L. A large dark-red oval organ on the left side of the body between the stomach and the diaphragm
13. Pathogen
M. Hypersensitivity reaction to a particular ___