Urinary System Worksheet


1)      What are the 3 primary nitrogenous wastes the human urinary system is tasked with riding the body of? Which one is the most abundant of the 3 in urine? ______________



2)    Which organ is the primary functional organ of the human urinary system? ___________


3)    Other than forming urine, what are 2 additional functions of the kidneys? __________ __________________________________________________________________


4)    Which organs facilitate movement of urine from the kidneys to the bladder? _________ __________________________________________________________________


5)    How does the bladder accommodate storage of increasing amounts of urine? _________



6)    How does the urethra a) prevent leaking from the bladder between micturition; and 2) allow voluntary control of micturition? ______________________________________



7)    Approximately how many mL of urine must accumulate in the bladder to initiate the voiding reflex? ______________________


8)    If micturition is not allowed by the voluntary nervous system, approximately how many mL of urine must accumulate in the bladder before the involuntary voiding reflexes take control of the process? _______________


9)     Describe the 3 sections of the internal anatomy of a kidney, looking at a frontal section. Include the renal pyramids. ______________________________________________



10) Which section of the kidney is the most common place for the formation of kidney stones? __________________________________


11)  How much of the total cardiac output is delivered along the renal arteries to the kidneys per minute? _________________________


12)  What is the structural and functional unit of the kidneys? How many of them are there in each kidney? ____________________________________


Matching. Match each process to the correct description or portions of the nephron in which they take place (HINT: Many processes will be listed in more than one section of the nephron!).

a. filtration                                 b. tubular reabsorption- primary active           

c. tubular reabsorption- passive   d. tubular reabsorption- secondary active

e. tubular secretion

13)  Blood purification process forces waste products as well as useful substances to move from the blood to the urine  _____________

14)  Blood purification process that transports additional waste products or excess substances from the blood into the urine ______________

15)  Glomerulus _____________

16)  Bowman’s Capsule _____________

17)  Proximal Convoluted Tubule _________________

18)  Descending Loop of Henle __________________

19)  Ascending Loop of Henle ___________________

20)  Distal Convoluted Tubule ______________________

21)    Collecting Ducts_________________________

22)  Process to reabsorb H2O into blood_______________________

23)  Process to reabsorb Na+ into blood ___________________________

24)  Process to reabsorb organic nutrients into blood __________________________

25)  Process to reabsorb anions (Cl-, etc) into blood __________________________


25) Which section of the nephron allows for reabsorption of virtually all nutrients and 2/3 of water and sodium? ____________________________


26) Which section of the nephron allows for reabsorption of water only (no ions or nutrients)? ___________________________________


27) Which sections of the nephron allows for reabsorption of ions only (no water or nutrients)? ___________________________________


28) Which sections of the nephron allow for secretion into the forming urine? __________



29) What is the primary regulatory factor for the chemical composition and volume of urine formed by the nephrons in the kidney? _____________________________________