Here’s some cardio lecture crammed into a gif. >_> You see I DO STUDY!!

I tried to match the gif’s frame rate timing to a real resting heartbeat, so if you’re sitting at a computer this might match you! The rate for this heart is 72 bpm. (unless it’s lagging. please do not match the lagging heartbeat, only zombies do that.) 

Someone asked if I could add a slow-motion version to this post to make the steps more visible. I present to you: the gif at 1/3 speed.

And here are the individual frames! At ~0.1 seconds each, there are 8 frames in the gif, 3 of which are spent in ventricular systole, and the remaining 5 in diastole. You can see the time stamp on the lower left. 

I hope this helps! Good luck with your studying! (and thank you so much for all the notes, wow.)