And this is the period at which if we apply a stimulus, no matter how high the stimulus is, our action potential will not begin again. We will not begin to initiate an action potential in the absolute refractory period. Now, we also have the relative refractory period, and this is this region here. So this entire region from this point to this point is known as the relative refractory period. Because if we apply a very high stimulus at this point, an action potential can be achieved. So that's exactly why I mentioned the fact that as the voltage membrane reaches the threshold value of negative 45, so as it goes back to this value at this point, our inactivated sodium channels begins to recover.