What is the definition of Circulation Studies?

"Circulation studies" are like the medical version of a traffic jam, but instead of cars, it's blood flowing through our veins and arteries. They're essentially a detective story for our circulatory system, trying to figure out why our blood is running slower than expected.

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Here's a dude-ific example sentence: "After the marathon, our circulation studies showed we were more like a sluggish, sleepy old librarian than a spry marathon runner."