NEET Biology question
You are required to draw blood from 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: (A)
Solution
Calcium ions actively promote blood coagulation (they are required at several steps of the clotting cascade), so a test tube containing calcium bicarbonate would cause the blood sample to clot, destroying the very corpuscles and plasma that need to be analysed. A chilled tube,
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