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Choose the best word for each sentence. Use each word only once.
сrudely stretch own regenerate
magnified congregation damages contract
deformity tissue supporting heals
unfortunately classified
1. The human body is a ___ of an estimated 26 trillion cells…
2. Most cells are so small that they can be seen only when greatly ___.
3. The nucleus is, ___ the heart and reproductive system of the cell.
4. A group of cells form a ___, like muscle tissue.
5. Each cell has its ___ life span.
6. Thus, for example, muscle cells ___ and contract, nerve cells carry signals.
7. Anything that cuts off the blood supply to a part of the body kills and ___ cells.
8. A disease process is an essence damage or ___ of cells, which can no longer perform their functions.
9. … a broken bone, for example, ___ by replacement of cells.
10. Unfortunately nerve cells do not ___.
11. Connective tissue cells make up the ____ tissues of the body.
12. Muscle cells which have the power to expand and ___, are of three kinds…
II. Answer the questions.
1. What are cells?
2. How many cells are there in the human body?
3. How much do the cells measure?
4. What does a cell consist of?
5. What is the life span of a cell?
6. What do muscle cells and nerve cells do?
7. How can cells be damaged and killed?
8. Do nerve cells regenerate?
9. How can cells in the human body be classified?
10. Where are epithelial cells found?
11. What do connective tissue cells do?
12. What kind of power do muscle cells have?
13. Where are sex cells found?
III. Change the following statements to questions supplying short answers.
Example: Signals are carried by nerve cells. - Are signals carried by nerve cells? - Yes, they are.
1. A developing embryo can be affected by a disease of the mother.
2. Paralysis is caused by the polio virus.
3. The virus that causes yellow fever in man was found in 1901.
4. Several types of microbes will be seen.
5. The fertilized eggs were implanted in human mothers.
6. The smallest and the largest known viruses have been measured.
7. This is not going to be decided by the ethicists.
IV. Choose the correct word corresponding to the definitions below.
protoplasm, blood, poison, muscle, hormone, tissue
1. Internal secretion that passes into the blood and stimulates the bodily organs.
2. Elastic substance in an animal body that can be tightened or loosened to produce movement.
3. Colorless, jelly-like substance which is the material basis of life in animals and plants.
4. Mass of cells and cell products in an animal body.
5. Red liquid flowing throughout the body of man and the higher animals.
6. Substance causing death or harm if absorbed by a living thing (animal or plant).
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