Is that a 7th heart chamber?
Word is per the 'anatomy of a vampyre' that between in the lower right calf is a 1 chambered tiertiary heart like muscle. A monochamber bulb Pushing blood through the capillary circulatory loop. Skeletal single chambered pump like the bulb on a tube to take blood pressure a manual inflation bulb.
Yup i know.
Yup i know.