'Kidneys even have a sense of smell. To sift hundreds of blood and urine chemicals on the fly, expelling some and husbanding others in precise quantities, kidneys employ odor receptors similar to those found in the nose. “The kidney is sniffing the urine and the blood plasma as they go by,” says Jennifer Pluznick, associate professor of physiology at the Johns Hopkins School of Medicine, who discovered the organ’s olfactory gifts. “The kidney’s attention to detail is astounding. I’m convinced it has many other long-​held secrets which are waiting to be discovered.”

https://lithub.com/how-our-kidneys-keep-us-healthy-and-what-it-means-when-they-fail/