KROK 1 2009 – Question 71 · KROK (Medicine) · Physiology
Stimulation of an excitable cell by the electric current has led to the depolarization of its membrane. The depolarization has been caused mainly by the following ions penetrating into the cell through its membrane:
- A. K⁺
- B. Na⁺
- C. HCO₃⁻
- D. Ca²⁺
- E. Cl⁻
Hint
Ask which ion's fast voltage-gated channels open once the stimulus reaches threshold, and in which direction that ion's net electrochemical force drives it.
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