Solve the crossword puzzle with the help of the clues given below:

Across

4. Food conducting tissue in plants. (6)

8. The rhythmic contraction and expansion of the heart. (9)

9. The technique used for removing toxic materials from the blood, when the kidneys are not functioning. (8)

10. The pigment in red blood cells. (11)

11. Muscular organ present in the chest cavity taking part in the transport of blood. (5)

14. Loss of water in vapour form of the leaves. (13)

15. The upper chambers of the heart. (8)

16. Water conducting tissue in plants. (5)

17. Removal of waste materials from the body. (9)

18. Bean-shaped structure taking part in excretion. (6)

19. Blood vessels which carry CO₂ rich blood from different parts of the body. (5)

Down:

1. The term for the lower chambers of the heart. (10)

2. The throbbing of the arteries. (5)

3. The fluid flowing in blood vessels. (5)

5. Blood vessels which carry oxygen-rich blood from the heart. (8)

6. The fluid part of the blood. (6)

7. The tissue in plants which transports water, nutrients and food. (8, 6)

12. The channels in which blood flows. (5, 7)

13. Fine blood vessels which form a connection between arteries and veins. (11)