• Proximal tubule: NaCl and water, along with some ions and nutrients are reabsorbed.
  • Descending limb of loop of Henle: Reabsorption of water continues by osmosis.
  • Ascending limb of loop of Henle: Reabsorption of NaCl continues.
  • Distal tubule: Secretion of H^+ helps regulate pH.
  • Collecting duct: More NaCl is reabsorbed to maintain a high osmolarity in the inner medulla.

    Excretion occurs when urine is expelled from the urinary bladder through the urethra.

    Review: