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What is blood? How much blood does a person have? What is the composition of blood? What are the functions of these components? How is blood formed? What is haemoglobin? What are blood groups? What is the importance of knowing the blood groups? Why is A group not given B group blood? Why are Rh negative and Rh positive incompatible? What is a unit of blood? Can blood of animals be transfused to human beings? How long can blood be stored? Can we separate blood into its components? Transfusion In which situations do patients need blood transfusion? Do you test all the collected blood? What happens to patients in transfusions with incompatible blood (mismatched blood)? Donating blood In which situations do people generally donate blood? Who is a healthy donor? Does a donor need to do anything special before donation? How long does the donation take? Does the needle hurt the entire time? Does the donor suffer from any harmful effects after donating blood donation?...