Which is/are true concerning the glomerular filtration rate?   a. The body maintains a nearly constant GFR despite changes in blood pressure, as long as blood pressure is between 80 and 180 mmHg   b. Below 80 mmHg, the GFR is controlled by autoregulation   c. GFR is under both intrinsic and extrinsic control   d. The juxtaglomerular apparatus has access to information about the osmolarity of the filtrate, as well as the blood pressure

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