11. Blood group which have no antibodies
12. The sound lub-dub lub-dub is produced by
13. Blood is red in colour due to the presence of ________
14. Life of red blood cells in the body is
15. The upper chambers of the heart are the
16. Purification of blood takes place in
17. Fully mature human RBCs has
18. Which of the following blood group is universal donor?
19. Human heart is made up of
20. Antigens 'A' and 'B' are absent in persons belong to blood group
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