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NEET Biology Principle Of Inheritance And Variation Question Bank Critical Thinking

  • question_answer
    When whole blood is stored with an anticoagulant at \[4{}^\circ C\], the \[{{K}^{+}}\]ions move out from the RBC into the plasma. The most likely reasons for this is that [AIIMS 1982; DPMT 1992]

    A) RBC haemolyses and hence leakage of \[{{K}^{+}}\]ions

    B) \[{{K}^{+}}\] ions become more mobile at\[4{}^\circ C\]

    C) Active transport ceases resulting in ionic equilibrium

    D) The anticoagulant attracts the \[{{K}^{+}}\]ions into the plasma

    Correct Answer: B

    Solution :

    Blood is stored with an anticoagulant at 4°C. At normal temperature due to potassium pump, K+ ions are more inside RBC than plasma. Low temperature stops the potassium pump; i.e., inhibit active transport, K+ ions come out from RBCs resulting in ionic equilibrium.


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