The Immune System
Name: ______________________ Date: ____________
Write the letter of the matching definition next to each term.
1. lymphocyte
A. Any disease-producing agent
2. HIV
B. A collection of lymphatic tissue in the throat behind the uvula
3. antigen
C. The virus that causes acquired immune deficiency syndrome
4. diseases
D. The work of providing treatment for or attending to someone or something (plural)
5. pathogen
E. A person who contributes to the fulfillment of a need or furtherance of an effort or purpose
6. adenoid
F. Any substance that stimulates an immune response in the body
7. cytotoxic
G. Immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order
8. spleen
H. An illness that harms the body (plural)
9. helper
I. Either of two masses of lymphatic tissue one on each side of the oral pharynx (plural)
10. vaccine
J. Of or relating to substances that are toxic to cells
11. tonsils
K. An agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but
12. AIDS
L. A large dark-red oval organ on the left side of the body between the stomach and the diaphragm