V. Give the antonyms

destruction	healthy
to join	to remember
constituent	creation
capable	slower
harmful	whole
to protect	incapable
including	to divide
health	useful
to forget	excluding
quicker	to invade

VI. Match the definitions:

to induce	to go to by force in order to conquer;
to attempt	the act of destroying or the state of being destroyed;
to counteract	to cause to happen (occur);
constituent	to cause to begin;
marrow	to oppose & infective by contrary action;
congragate	a component part
to engulf	to make an effort;
to invade	the soft material that fills bone cavities;
destruction	to enclose completely;
to initiate	to come or to bring together

VII. Read and translate the text

VIII. Answer the questions

1. What is called immunogen?

2. What is called antigen?

3. What is antibody?

4. What plays a special part in the immune system?

5. What is a complement? What’s its function?

6. What are phagocytes?

7. What is called phagocytosis?

8. What is called phagocytosis?

9. What is the function of WBC?

10. How are WBCs act in case of injury?

11. What substances are phagocytic?

12. What does pus consist of?

13. What types of WBCs of can you name?

IX. Complete the sentences:

1. Any substances that is capable of ... an immune response is called ... .

2. Any foreign substance that ... the body to produce antibodies which attempt ... that foreign substance is called ... .

3. Antibody combines with an antigen and ... it.

4. One of the complement ... parts ... antibodies molecules and ... the destruction of the cells, containing antigens against which these antibodies have been ... .

5. The ... of harmful material by phagocytes is called ... .

6. White blood cells help to ... .

7. When the body is injured or infected WBCs pass through the walls of the capillary blood vessels and ... at the ... of injury or infection.

8. Pus consists of ... .

9. Immune response is usually carried out by ... ... .

X. Say it in one word

1. A substance, capable of inducing an immune response.

2. A foreign substance stimulating the production of antibodies.

3. A substance that combines with an antigen and neutralizes it.

4. The absorption of harmful material by phagocytes.

5. Accumulation of dead neutrophils, monocytes, bacteria and tissue.

6. Cells which produce chemical substances called antibodies that attack specific viruses or bacteria.

7. Cells which remember the invading organism for a long time to come, initiating a quicker response to subsequent infection.

8. Cells which slow down or stop the activities of B - and other T – cells after infection has been eliminated.

9. Cells which produce substances to fight off foreign organisms and even kill cells already infected. (Antigen, phagocytosis, B-cells, memory cells, helper & killer T-cells, suppressor, pus, immunogen, antibody).