What happens during a Heart Attack?

I sometimes use YouTube for my studies and as I was studying heart diseases I stumbled upon this video of what happens during a heart attack. It's an amazing overview of what happens and it helped me learn the overview of it. The video is so amazing, touching, fascinating, scary, epic, everything! Mostly wow! WOW, like.. Wow, as for the understanding. How we understand how the body works. It's so damn amazing that we know what happens during diseases and I am so grateful to be a student of this topic!!