Absolute & Relative refractory period
ABSOLUTE Refractory Period – Any stimulus (Any strength) – NO RESPONSE (NO AP).
RELATIVE Refractory Period – From 1/3rd Repolarization till End of AP.
ONLY STUIMULUS OF MAXIMUM STRENGTH CAN PRODUCE RESPONSE.
During Depolarization Na+ influx happens due to Voltage gated Na+ channels - With this in MIND GATE CONCEPT EVOLVED
Absolute & relative refractory period explained in the form of a graphical illustration