Urinary System Quiz
Questions: 16 · 10 minutes
1. Where does the initial filtration of blood plasma occur within a nephron?
In the collecting duct
Across the glomerular capillaries into Bowman’s capsule
In the loop of Henle
Across the wall of the ureter
2. Which statement best summarizes the kidneys’ main role in the urinary system?
They filter blood, remove wastes, and help regulate fluid and electrolyte balance.
They store urine until it can leave the body.
They carry urine from the bladder to the exterior.
They produce digestive enzymes and release them into the intestine.
3. What normally happens to water in the descending limb of the loop of Henle?
Water and large blood proteins are filtered into Bowman’s capsule there.
Water is actively pumped into the tubule while sodium leaves.
Water cannot cross the tubule wall, but glucose is secreted into it.
Water leaves the tubule by osmosis while many solutes remain in the tubular fluid.
4. A stone blocks the narrow tube that normally carries urine from one kidney to the bladder. Which structure is obstructed?
Urethra
Collecting duct
Renal vein
Ureter
5. Once urine enters a renal pelvis, which route carries it out of the body in the correct order?
Urethra → bladder → ureter
Ureter → urethra → bladder
Ureter → bladder → urethra
Bladder → ureter → urethra
6. A person consciously delays urination even though the bladder is full. Which structure provides the main voluntary control involved?
Internal urethral sphincter
Ureterovesical junction
External urethral sphincter
Renal pelvis
7. Which comparison between the renal cortex and renal medulla is accurate?
The cortex stores urine, while the medulla releases it through the urethra.
The cortex contains renal corpuscles, while the medulla contains renal pyramids with loops and collecting ducts.
The cortex surrounds the bladder, while the medulla forms the bladder lining.
The cortex contains only blood vessels, while the medulla contains all nephrons.
8. The bladder must stretch as it fills and recoil after emptying. Which epithelial tissue is specialized for this repeated change in shape?
Transitional epithelium, also called urothelium
Simple squamous epithelium
Ciliated columnar epithelium
Keratinized stratified squamous epithelium
9. What is the microscopic functional unit of the kidney that filters blood and modifies the resulting fluid?
Lobule
Alveolus
Nephron
Villus
10. In a healthy person, most glucose that enters the nephron filtrate is reclaimed early in the tubule. Where does this mainly occur?
Proximal convoluted tubule
Renal pelvis
Ureter
Urinary bladder
11. Which sequence correctly traces blood flow from the renal artery toward and through the glomerulus?
Renal artery → efferent arteriole → glomerulus → afferent arteriole
Renal artery → glomerulus → renal vein → afferent arteriole
Renal artery → ureter → afferent arteriole → glomerulus
Renal artery → smaller arterial branches → afferent arteriole → glomerulus → efferent arteriole
12. A laboratory test detects an unusually large amount of albumin, a blood protein, in urine. Which renal process is most directly implicated?
Selective filtration at the glomerular barrier
Urine propulsion through the ureter
Voluntary opening of the external urethral sphincter
Urine storage by the bladder wall
13. When antidiuretic hormone increases the water permeability of collecting ducts, what is the expected result?
Less water is reabsorbed, producing a smaller volume of dilute urine.
More water is reabsorbed, producing a smaller volume of more concentrated urine.
More glucose is filtered, producing urine with no water.
Less blood reaches the kidneys because the ureters constrict.
14. After prolonged sweating without enough fluid replacement, which urine pattern would functioning kidneys generally produce in response to water conservation signals?
A larger volume of more dilute urine
A larger volume containing many blood cells
A smaller volume of more concentrated urine
A smaller volume containing no dissolved wastes
15. If body fluids remain too acidic, how can the kidneys contribute to restoring acid-base balance?
By storing hydrogen ions in the bladder wall
By preventing all salts from entering the filtrate
By moving urine from the urethra back into the kidneys
By increasing hydrogen ion excretion and conserving or generating bicarbonate
16. Which vessel carries blood directly from the abdominal aorta toward each kidney?
Renal vein
Renal artery
Efferent arteriole
Ureter