<iframe width="560" height="315" src="https://www.youtube.com/embed/j1SzjDpo0SE" frameborder="0" allowfullscreen></iframe>
This is how electricity conducts around our heart and gives the stimulation for it to contract in a averry organized way
<iframe width="560" height="315" src="https://www.youtube.com/embed/j1SzjDpo0SE" frameborder="0" allowfullscreen></iframe>
This is how electricity conducts around our heart and gives the stimulation for it to contract in a averry organized way