oxygen replenished via endocardial tubes

https://sh.itjust.works/post/45879275

Don’t let the spelunkers find out
Awww, as it turns out the sadaam was inside of us all along
B and C are a thumbs up
B and C are an upside down dick and balls you mean
Forever in our hearts.
He’s all twisted up in there
Now I’m curious if it used to be normally “unfolded” somewhere in our evolutionary past.
Simpler animals like insects and molluscs can have tube-like hearts, so it’s possible.