diff --git a/neuron/soma.md b/neuron/soma.md
index da63e98..cf74a8c 100644
--- a/neuron/soma.md
+++ b/neuron/soma.md
@@ -10,8 +10,16 @@ Qui comprendiamo:
 
 — ms:
 
+- Resting at -70 mV: Leak channels + pumps (keep at resting)
+- VDB Depolarization : ~1-2 ms: Na⁺ enters (some VGSCs open)
+- Opened VGSC remain closed for a refractory period
+ Spike if depolarized above threshold: to -50 mV
+- Repolarization to -70 mV:  ~1-2 ms: K⁺ exits (VG K⁺ channels open) ← NOT pumps!
+- After-hyperpolarization: ~5-20 ms: K⁺ channels still open
+
 — seconds:
 
+- Return to exact -70 mV: ~100-1000 ms: Na⁺/K⁺ pumps restore gradients
 - Ca2+ accumulation: SpikeTrainTraces
 
 — mins: