Question

18 what is the correct sequence of events that occurs along an axon after the membrane reaches threshold? 1 the membrane depolarizes. 2 sodium - channels open and sodium ions diffuse inward. 3. the membrane repolarizes. 4 potassium channels open and potassium ions diffuse outward. multiple choice 2,1,4,3 4,1,3,2 1,2,4,3 3,2,4,1

Explanation:

When the membrane reaches the threshold, sodium channels open first (sodium ions diffuse inward), which causes the membrane to depolarize. Then, potassium channels open (potassium ions diffuse outward), leading to repolarization.

Answer:

2,1,4,3