Question

Organize the major events of initiating a nerve impulse

1.
2.
3.
4.
5.
6.

A. Threshold is reached triggering in action potential as sodium rushes into Exon during depolarization.

B. Potassium gates remain open, allowing membrane potential to go below RMP causing hyperpolarization.

C. Sodium and potassium channels are closed as sodium potassium pumps restore the initial ion gradients.

D. Sodium channels, close and potassium channels open.

E. Potassium Russia is out of axon during repolarization.

F. Sodium begins to flow into axon in response to a stimulus creating a graded potential.

Answer 1

1. F — Sodium begins to flow into axon in response to a stimulus creating a graded potential.
2. A — Threshold is reached, triggering an action potential as voltage‑gated sodium channels open and sodium rushes into the axon (depolarization).
3. D — Sodium channels close and voltage‑gated potassium channels open.
4. E — Potassium rushes out of the axon (repolarization).
5. B — Potassium gates remain open, causing the membrane potential to go below RMP (hyperpolarization).
6. C — Sodium and potassium channels are closed as the Na+/K+ pumps restore the original ion gradients.

(Notes: corrected minor typos — “axon” instead of “exon,” and “rushes” instead of “Russia.”)