macrophages deem some red blood cells too damaged

An example of anthropomorpohic language in medical writing:

"During each passage through the hepatic and splenic circulation, the red cell is brought into proximity with the (RE [Reticuloendothelial]) system of macrophages, which detect flaws on its surfaces. Cells deemed too damaged are ingested and catabolised. Given these enormous stresses and the limited repertoire it possesses for repair and replacement of essential components, the red cell's endurance is indeed remarkable."

Benz, Edward J. (2018) Anemias, Red Cells, and the Essential Elements of Red Cell Homeostasis, in Edward J. Benz, Nancy Berliner, & Fred J. Schiffman, Anemia. Pathophysiology, Diagnosis, and Management, Cambridge University Press, 1-13.

(There is a highly impressive mechanism at work here, but clearly not one involving conscious judgement.) N.b., typically a human's red cell makes several hundred thousand circuits before being removed from the circulation after about 120 days, and the red cell is larger than the diameter of the smallest blood vessels it passes (is squeezed) through each circuit: "the red cell's endurance is indeed remarkable".

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Author: Keith

Former school and college science teacher, teacher educator, research supervisor, and research methods lecturer. Emeritus Professor of Science Education at the University of Cambridge.