In tetany hyperexcitability is due to:: (A) Low Ca++ causes | permeability to Na+, (B) Prevent k+ release, (C) Prevent Na+ & K+ release, (D) |Ca++ produce generation of AP
Answer is A. Ans. (a) Low Ca++ causes | permeability to Na+(Ref: Ganong, 25th ed/p.380)Reason for hyperexcitability in tetany - low serum calcium levels moves more sodium ions entry into the cell leading to more frequent action potential generation