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Major content provider: U.S. National Cancer Institute

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Urinary System: Unit Review


Here is what we have learned from this unit:

  • The urinary system rids the body of waste materials, regulates fluid volume, maintains electrolyte concentrations in body fluids, controls blood pH, secretes erythropoietin, and renin.
  • The components of the urinary system are the kidneys, ureters, urinary bladder, and urethra.
  • The primary organs of the urinary system are the kidneys, which are located retroperitoneally between the levels of the twelfth thoracic and third lumbar vertebrae.
  • The cortex and medulla make up the parenchyma of the kidney.
  • The central region of the kidney is the renal pelvis, which collects the urine as it is produced.
  • The functional unit of the kidney is a nephron, which consists of a renal corpuscle and a renal tubule.
  • The ureters transport urine from the kidney to the urinary bladder.
  • The urinary bladder is a temporary storage reservoir for urine.
  • The urethra is the final passageway for the flow of urine.
  • The flow of urine through the urethra is controlled by an involuntary internal urethral sphincter and voluntary external urethral sphincter.


David L. Heiserman, Editor

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Revised: June 06, 2015