Part of the nephron in the kidney cortex 2. the outer part of organs like the adrenal gland, cerebrum, or kidney nephron 3. the process of removing impurities from the blood ureter 4. a descending and ascending limb of kidney tubules medulla 5. the innermost layer of a body organ like the kidney or adrenal gland. metabolism 6. the sum of all body chemistry urethra 7. the functioning unit of the kidney for urine production bowman's capsule 8. the central region or cavity of the kidney where urine collects renal artery 9. arteries taking blood into the kidneys loop of henle 10. the tube connecting the kidney to the urinary bladder. filtration 11. the tube leading from the urinary bladder to the outside. urinary bladder 12. a sac which temporarily stores urine until it is excreted. pelvis