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Fill in the blanks with the corresponding words given below:
1.The centre of the circulatory system us the ........
2. The heart is a hollow muscular ..... which has four .....
3. The heart is divided into separate right and left parts bu the ......
4.Each of these parts has the ...... and the .....
5. The .... are located at the entrance and exit of each ventricle.
6. We call the valve that separates the chambers the atrium and the ventricle the .....
7. The walls of the arteries and veins are thicker than those of the .....
При помощи слов: valves, heart, ventricle, chambers, capillaries, septum, mitral valve, atrium, organ.
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