“That's that relaxed state. If you look at your bottom…” — Stuff You Should Know at 13:12
“That's that relaxed state. If you look at your bottom fist, it's still a fist. So what's happening is that your ventricles are contracting. So while the blood's flowing into the atria, the ventricles are pushing oxygen-poor and oxygen-rich blood out, either to the lungs or the rest of the body. Now do the opposite.…”
0:00
46:44