Refractory periods in Cardiac muscle cells

An amazing video to help you with understanding concept of different types of refractory period. Absolute refractory period and relative refractory period are explained in relation with characteristics of sodium channels. Also there is a question asked in beginning of video which is answered towards ending. Timeline 0:00 Introduction 0:09 Question 0:28 Characteristics of sodium channel 2:40 Refractory period definition 3:26 Absolute refractory period 3:51 Relative Refractory period 4:33 Answer to question asked in beginning