where did the term blood is thicker than water come from
Blood is thicker than water The equivalent proverb in German (originally: Blut ist dicker als Wasser), first appeared in a different form in the medieval German beast epic Reinhart Fuchs (c. 1180; English: Reynard the Fox) by Heinrich der Glîchezære. The 13th-century Heidelberg manuscript reads in part, "ouch hoer ich sagen, das sippe blůt von wazzere niht verdirbet" (lines 265-266). In English we read, "I also hear it said, kin-blood is not spoiled by water." which may in part due to the high seas being tamed refer to distance not changing familial ties or duties.
Renal blood flow In the physiology of the kidney, renal blood flow (RBF) is the volume of blood delivered to the kidneys per unit time. In humans, the kidneys together receive roughly 25% of cardiac output, amounting to 1.1 L/min in a 70-kg adult male. RBF is closely related to renal plasma flow (RPF), which is the volume of blood plasma delivered to the kidneys per unit time.