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2 ] Fill in the gaps with the words from the box.

valves

deliver

plasma atria

carbon dioxide

contraction

ventricles

blood

vessels

  1. The ... are the upper chambers of the heart.

  2. During the ... phase, called systole, blood is pumped out of the left

ventricle into the aorta.

  1. The blood is made up of two parts: ... and blood cells.

  2. The function of the circulatory system is to ... energy and food

substances to each cell.

  1. The circulatory system consists of the blood, the heart and ... .

  2. The two lower chambers of the heart are ... .

  3. Used blood carrying ... is returned to the heart.

  4. ... control the flow of blood from one part of the heart to ano­

ther.

  1. | Match the nouns with the appropriate verbs.

the heart the blood the artery

Contract, pass, dilate, bring, regulate, pump, vary, beat, compose, work, consist of, discharge, receive, enter, act, serve, send, oxygenate, carry.

  1. | Choose the appropriate endings for the sentences.

1 The most numerous cellular elements of the blood are ... .

a white blood corpuscles

b red blood corpuscles

c blood platelets

2 The blood is the ... .

a connective tissue

b muscular tissue

c fluid

a through the aorta

b through the pulmonary

c through the por­

arteries

tal vein

3 The right ventricle discharges out the blood to the lungs ... .

4 The blood is discharged out ... .

a of the ventricles

b of the atria

c of the vena cava

; 5 Match the sentence beginnings with their endings.

1 The blood is made up of two parts

a to deliver energy and food sub­stances to each cell.

2 The plasma is composed of

b plasma and blood cells.

3 The corpuscles are divided into

c water and waste substances.

4 Hemoglobin is

d into red and white corpuscles.

5 The red corpuscles are

e left atrium.

6 The heart consists of

f coloured pigment in the red corpuscles.

7 From the lungs the blood returns to the

g the oxygen carriers of the body.

8 The function of the circulatory sys­tem is

i four chambers, two atria and two ventricles.

[_6JSay whether the following statements are true or false.

  1. The role of the circulatory system in transport of many substances is, in fact, insignificant.

  2. The heart is frequently referred to as a pump.

  3. Blood vessels transport blood with nutrients in one direction only, i.e. to cells.

  4. Arterioles are strong muscular tubes whereas arteries are fine thin- walled ramifications of vessels.

  5. Veins carry oxygen from the tissue cells back to the heart.

  6. Carbon dioxide is produced in cells.

  7. Waste products must be excreted from the organism.

  8. From the lungs deoxygenated blood returns to the left heart.

QTjRead 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 color 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 pulmonary artery. What blood is it?

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