A) \[N{{a}^{+}}\]ions help in the conduction of nerve impulses
B) \[N{{a}^{+}}\]ions are important in transport of substances across membranes
C) \[N{{a}^{+}}\]ions help to retain water in the body
D) \[N{{a}^{+}}\]ions are associated with all the above functions
Correct Answer: D
Solution :
Sodium is the principal cation of extracellular fluid, component of bile salts, which is involved in osmotic balance, acid-base balance, absorption of glucose and amino acids, electrochemical impulse conduction in nerve and muscle etc. Ifs deficiency produces cramps.
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