From the paper I was thinking of(link added to parent comment): "the velocity of...

		01100011 on March 21, 2020 \| parent \| context \| favorite \| on: If the heart is a muscle, why doesn't it ever get ... From the paper I was thinking of(link added to parent comment): "the velocity of the blood in the embryonic heart lumen exceeds the speed of the peristaltic wave moving through the lumen" which is interesting if you think of the heart as a peristaltic pump.