IX.* Закончите следующие предложения, выбрав необходимые сло­восочетания:

1. The most numerous cellular elements of blood are ... (a) white blood corpuscles; 6) red blood corpuscles; в) blood platelets) 2. Blood is ... (a) a connective tissue; 6) a muscular tissue; в) a fluid tissue; r) a nervous tissue) 3. The right ventricle discharges out the blood to the lungs ... (a) through the aorta; 6) through the pulmonary arteries; в) through the portal vein) 4. The blood is discharged out... (a) of the ventricles; 6) of the atria)

X.* Повторите тексты а, с. Прочитайте следующие предложения и скажите, о чем в них говорится:

1. This part of the heart discharges out the blood received from the pulmonary circulation through the aorta to the systemic circulation. 2. This part of the heart discharges out the blood received from the systemic circulation to the lungs through the pulmonary arteries. 3. These corpuscles have great elasticity and flexibility. These features give them the possibility to pass through very small capillaries. 4. The. count of these corpuscles in the blood of a healthy person is from 5,000 to 7,000 per cu mm. The number of these corpuscles increases when a person becomes ill.

XI. Прочитайте и запомните интересные факты:

Do you know that

1. each erythrocyte lives 120-130 days? 2. each leucocyte lives 4-7 days? 3. every day 200,000,000 erythrocytes are born and the same number dies?

Class assignments

XII. Translate the following indefinite personal sentences: .

1. It is known that blood becomes oxygenated in the lungs. 2. They say that patient Smirnov's health will be restored soon. 3. One knows that pulse rate becomes rapid on physical exertion. 4. It is estimated that his body weight considerably decreased during the prolonged illness.

XIII. Answer the following questions:

1. How many days does each erythrocyte live? 2. How many days does each leucocyte live? 3. How many erythrocytes are bom and die every day?

XIV. Read and translate the following sentences:

1. When a muscle fiber contracts so that its length does not change, one of the discs becomes shorter and the other longer. 2. The pressure in the cranial cavity is sometimes increased as a result of the increase in arterial pressure. 3. In the man the corpuscles may compose from 39 to 50 per cent of the blood volume. 4. Can life exist without oxygen? 5. A cardiac cycle is composed of the wave of contraction and a period of rest. 6. In the human body sex differences exist in the inner organs and their functions.

XV. Read the passages and answer the questions:

1. This substance is composed of plasma, red corpuscles, white corpuscles and platelets. What substance is it?

2. These cellular elements are the most numerous in the blood. They range from 4 to 5 million per cu mm in healthy adults. Their colour(ing) is red. What cellular elements are they?

3. This blood is brought to the heart from systemic and portal circulations. It enters the right atrium of the heart. Then this blood passes into the right ventricle. From the right ventricle this blood passes into the pulmonary artery. What blood is it?