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4.Principles of Inheritance and Variation
normal
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
A
$RBC$ haemolyses and hence leakage of ${K^ + }$ ions
B
${K^ + }$ ions become more mobile at $4°C$
C
Active transport ceases resulting in ionic equilibrium
D
The anticoagulant attracts the ${K^ + }$ ions into the plasma
(AIIMS-1982)
Solution
(b) 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.
Standard 12
Biology
