ATI RN
Questions About The Urinary System Questions
Question 1 of 5
Which of these has the highest concentration in the urine?
Correct Answer: C
Rationale: Uric acid concentrates in urine as a waste product, unlike glucose (reabsorbed), sodium (regulated), or phosphate (variable). This highlights excretory priority, vital for purine metabolism, contrasting with reabsorbed substances.
Question 2 of 5
The entrance into the kidney is called the
Correct Answer: C
Rationale: The hilum is the kidney's entry/exit point for vessels/ureter, not sinus (cavity), column (cortex), or pyramid (medulla). This defines renal gateway, vital for vascular connections, contrasting with structural terms.
Question 3 of 5
Renal secretion of a compound usually occurs from the into the distal convoluted tubule.
Correct Answer: D
Rationale: Secretion moves substances from peritubular capillaries to DCT, not loop, glomerulus (filtration), or vasa recta (exchange). This defines secretion pathway, vital for drug elimination, contrasting with reabsorption.
Question 4 of 5
Which of these is under voluntary control?
Correct Answer: D
Rationale: External urethral sphincter is voluntary (skeletal muscle), unlike urethra (tube), detrusor (involuntary), or internal sphincter (smooth). This identifies micturition control, vital for continence, contrasting with involuntary structures.
Question 5 of 5
The fluid in the descending limb of the loop of Henle is relative to the capillaries.
Correct Answer: D
Rationale: Descending limb fluid becomes hypertonic as water exits into concentrated medullary interstitium, not isotonic/hypotonic. This describes countercurrent effect, vital for urine concentration, contrasting with initial states.