hello on my google travels this afternoon (it’s not all bad, you have to sort the wheat from the chaff) I found the following:
healthline.com/human-body-m...
I wanted to learn more about the heart and how it works and I found the above easy reading. The 3d diagrams are good.
I make no claim as to being accurate but the sources at the bottom include BHF and NHS and states has been medically reviewed so pretty ok I think.
Hope of use to anyone else. Back to my google travels.
👍