Lesson 12.1 Crossword
Across
1. | two masses of lymphatic tissue that lie in the back of the mouth, on the left and right sides; the largest and most commonly infected tonsils |
6. | lymphatic tissue that lies at the back of the nasopharynx, the part of the throat above the palate, and opens into the nasal cavity; commonly called the adenoid |
8. | tissue flaps that act as one-way valves inside the lymphatic vessels |
9. | two masses of lymphatic tissue that lie on either side of the base of the tongue |
10. | lymphocytes that complete their maturation in the thymus before they move out to the blood and the rest of the body; also called T cells |
11. | vessels that carry lymph |
Down
2. | the largest lymphatic organ in the body, located in the abdomen below the diaphragm; filters blood and activates an immune response if necessary |
3. | lymphocytes that mature in the bone marrow before moving out to the blood and the rest of the body; also called B cells |
4. | cells that phagocytize (surround and destroy) foreign cells, such as bacteria and viruses |
5. | small, bean-shaped structures found along the lymphatic vessels throughout the body |
7. | disease-causing agents |