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NEET Sample Paper NEET Sample Test Paper-13

  • question_answer
    You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose?

    A)  Chilled test tube

    B)  Test tube containing heparin

    C)  Test tube containing sodium oxalate

    D)  Test tube containing calcium bicarbonate

    Correct Answer: C

    Solution :

     Clotting of collected blood can be prevented by: Coating test tubes with silicon (which produce non-wettable surface similar in its smoothness to endothelial lining of blood vessel.) Adding chelating agents (includes trisodium citrate, sodium oxylate and sodium EDDTA) which remove calcium which is important for blood coagulation and prevent blood clotting. By adding heparin, most powerful anticoagulant which acts indirectly by activating plasma anti- thrombin III.


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