This is a visual by Mike Kacsur my EMT instructor. It’s called “The Box Heart”. The TAs giggled about it, but I thought it was a great visual aid that was easy to conceptualize and easy to memorize (as evidenced by my score on the test) 🙂 Yes it’s simplistic, but effective.
Here is my original scrawled note…
You can enlarge it if you like, but it won’t be any easier to read!
Here is one that I made in dia.