NEET 2004 Biology question
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?
Answer: (4)
Solution
To obtain both plasma and corpuscles the blood must be kept from clotting. Heparin is a natural anticoagulant (it inhibits the conversion of prothrombin to thrombin), so (2) is suitable. Sodium oxalate precipitates the ions that are essential for clotting, so it acts as an anticoagulant
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