When a kidney is cut lengthwise, three distinct regions become apparent. the outer region is light in color, while the deeper "middle" region is darker reddish-brown. the inner deepest region is flat and tube-like. correctly label the three kidney regions on the coronal section below?

There are three main regions of the kidney.
1.Renal cortex -  It is the outer region of the kidney which contains the renal corpuscles and the renal tubules (without the loop of Henle). It produces the erythropoietin.
2.Renal medulla  - It is the innermost part of the kidney which contains the renal pyramids.
3.Renal pelvis  -  It is the region that collects urine from the nephrons, thus it contains the place where ureter leaves the kidney.

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