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2. Translate into Russian, pay attention to Participles.

1.Protoplasm is organized and divided into cells, each cell having an individuality of its own.

2.The chromatin network in the cell is composed of a defi­nite number of chromosome threads, the number being constant for each species.

3.Flagella are longer and less numerous than cilia, each cell usually possessing only one or two.

4.Through the continuous increase in the number of cells, an organism grows until it reaches its adult size, its cells differentiating at the same time into the various tissues and organs that make up its body.

5.In a process called cytokinesis, the cytoplasm of the cells is divided into two parts, each containing one of the newly formed nuclei.

6.The liver occupies the upper right quadrant of the abdo­minal cavity, a part of its surface being attached to the diaphragm.

7.Erythrocytes are non-nucleated cells whose sole function is that of transporting oxygen. They are the most numer­ous of the formed elements of blood, the number in do­mestic animals varying greatly among different species.

8.Some powerful chemicals destroy organisms completely, the action being in part hydrolysis.

3. Use the verbs given in brackets in the right form (Ac­tive or Passive).

Over the years, pet therapy (help) difficult children, lonely old people and anti-social prisoners. In the 18th cen­tury, a doctor (fill) the grounds of a hospital with chickens, rabbits and goats. Many years later, in New York, animals (recrute) to help with rehabilitating soldiers who (wound) in World War II.

Research (show) that pet owners (live) longer. It (find) that stroking a cat or dog (lower) the blood pressure, and a dental school (discover) that gazing at fish (help) you re­lax. One researcher, Dr. Levinson, (bring) his dog to ther­apy sessions with a withdrawn child, who (become) much more sociable. It (discover) also that people (suffer) from fewer illnesses like colds, backaches and stomach problems after they (acquire) a pet.

Summary work

I. Supplementary reading.

Blood cells

1. Read the text and translate with your dictionary.

Blood cells are of three kinds: red blood cells (erythrocytes), white blood cells (leukocytes and lymphocytes), and blood platelets. Red blood cells are approximately round, disk-shaped with high edges. They measure approximately 1/3,000 of an inch in diameter. The healthy male has about 5 million red blood cells per cubic mil­limeter of blood. A healthy woman has about 10% fewer.

Hemoglobin is the key element in the red blood cell. It is a com­plex protein that requires iron for its formation. Oxygen picked up in the lungs during the circulation of the blood combines loosely with hemoglobin. Then, in every part of the body where it is needed for cell metabolism, oxygen is released by the hemoglobin, which picks up carbon dioxide on the return journey to the heart and lungs.

Red blood cells are destroyed and replaced at a rate of about 1% a day. These cells are formed in the bone marrow, particularly in the spine and hip bones, the ribs and breast-bone. They are de­stroyed largely in the spleen.

White blood cells are about 1.5 to 2 times as large as red blood cells, which outnumber them by at least 500 to 1. The average number of white blood cells in the healthy adult is around 7,000 per cubic millimeter. In the presence of infection this number may go as high as 40,000. A great increase in the white blood count is al­most always a sign of infection.

White blood cells play the role of scavenger. Most of them en-gulf and devour bacteria and other particles of foreign matter in the blood stream. Hence they prevent and fight infection and aid in wound repair. Pus is made up largely of dead white blood cells.

The names of various different kinds of white blood cells are long and complicated: for example, polymorph nuclear eosin Phil. Because they devour bacteria, they are also called phagocytes. White blood cells are made in the bone marrow, the lymph nodes, and other places in the body.

Blood platelets are about 1/3 as large as red blood cells. They are concerned with blood clotting.