ATI LPN
Urinary System Questions and Answers Questions
Question 1 of 5
Asymptomatic bacteriuria is never treated except when?
Correct Answer: B
Rationale: Asymptomatic bacteriuria is treated only in pregnancy to prevent complications.
Question 2 of 5
The nurse assesses an adult client 24 hours after a bowel exploration and formation of a sigmoid colostomy. Which assessment finding should be reported to the surgeon immediately?
Correct Answer: C
Rationale: A purple stoma mucosa 24 hours post-sigmoid colostomy should be reported to the surgeon immediately. This color indicates potential ischemia or necrosis due to inadequate blood supply, a surgical emergency risking stoma failure or perforation. Bright red blood is normal initially, absent bowel sounds are expected post-op, and solid brown fecal matter is typical, but purple mucosa signals compromised tissue viability, necessitating urgent evaluation and possible revision.
Question 3 of 5
Describe the sensation from the urinary bladder at 150-300 ml urine volume.
Correct Answer: B
Rationale: At 150-300 ml of urine volume, the urinary bladder triggers the first urge to void. Stretch receptors in the bladder wall detect this initial distension, sending signals via afferent nerves to the spinal cord and brain, initiating the micturition reflex's sensory component. This sensation precedes fullness (300-400 ml), discomfort (400-600 ml), and pain (600-700 ml), as bladder stretch intensifies with increasing volume, making B the accurate description.
Question 4 of 5
When the urinary becomes stretched, there's an increase in the frequency of action potentials traveling from?
Correct Answer: A
Rationale: Bladder stretch from filling increases action potentials in afferent pelvic nerve fibers, traveling from the bladder to the sacral spinal cord (S2-S4). This initiates the micturition reflex. Parasympathetic (B) and somatic (C) neurons are efferent, and ascending pathways (D) follow later, making A the correct initial sensory pathway.
Question 5 of 5
The only part in nephron which is permeable to water and impermeable to ions:
Correct Answer: B
Rationale: The thin descending limb of the Loop of Henle is permeable to water via aquaporin-1, allowing water to exit into the medullary interstitium, but impermeable to ions, concentrating the filtrate. The PCT (A) and collecting ducts (C) reabsorb ions, and the thick ascending limb (D) is impermeable to water, making B uniquely correct.