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WorksheetsCh 7 Practice Questions
Total questions: 10
Worksheet time: 5mins
A 70-year-old man presents with progressive difficulty initiating urination, a weak urinary stream, and the need to urinate multiple times at night. Bladder ultrasound shows significant post-void residual urine. Which underlying process is most likely responsible for these findings?
Fibrotic narrowing of the urethra due to previous catheterization trauma causing fixed obstruction
Hyperplasia of periurethral prostate tissue compressing the prostatic urethra and increasing resistance to urinary outflow
Involuntary bladder contractions caused by detrusor overactivity leading to urgency incontinence
Spinal cord injury disrupting parasympathetic innervation to the bladder causing impaired detrusor contraction
A 58-year-old woman with a history of recurrent urinary tract infections now presents with fever, flank pain, and costovertebral angle tenderness. Urinalysis reveals white blood cell casts. Which explanation best accounts for these findings?
Localized bacterial infection of the bladder mucosa causing irritation and pain
Ascending bacterial infection reaching the renal pelvis and tubules, triggering inflammation and leukocyte migration into the tubular lumen
Hematogenous spread of bacteria directly to the glomeruli resulting in immune complex deposition
Chronic inflammation of the bladder wall causing urgency and suprapubic pain without systemic involvement
A patient with advanced chronic kidney disease has persistent fatigue, pallor, and laboratory evidence of normocytic anemia. Which mechanism most accurately explains the anemia in this context?
Chronic blood loss into the urinary tract from repeated microscopic hematuria causing iron depletion
Reduced renal production of erythropoietin leading to decreased stimulation of bone marrow erythrocyte production
Increased destruction of red blood cells due to accumulation of uremic toxins in the bloodstream
Suppression of bone marrow hematopoiesis from long-term exposure to nephrotoxic medications
A 45-year-old man presents with sudden onset of severe flank pain radiating to the groin, accompanied by visible blood in the urine. Which sequence of events best explains the pathophysiology of his condition?
Deposition of immune complexes in glomeruli leading to rupture of the glomerular basement membrane and RBC leakage
Acute bacterial infection of the bladder mucosa causing breakdown of small submucosal vessels and hematuria
Formation of a urinary calculus that obstructs the ureter, causing ureteral spasm, increased intraluminal pressure, and mucosal irritation with bleeding
Overdistension of the bladder wall due to urinary retention causing rupture of superficial capillaries
Urinalysis from a patient with dysuria and frequency shows positive nitrites and leukocyte esterase. Which explanation best links these findings to the likely diagnosis?
Overgrowth of non-bacterial organisms that metabolize urinary glucose producing irritant byproducts
Autoimmune attack on bladder mucosa leading to epithelial shedding and WBC infiltration
Gram-negative bacteria capable of reducing urinary nitrates to nitrites, accompanied by neutrophil release of esterase into the urine during infection
Viral infection of the urinary tract causing shedding of transitional epithelial cells and inflammatory mediators
A 30-year-old woman presents with generalized edema, frothy urine, and laboratory findings of proteinuria >4 g/day. Which pathophysiologic event best explains her symptoms?
Immune complex–mediated inflammation of glomerular capillaries allowing RBC leakage into urine
Damage to podocyte foot processes and slit diaphragms increasing permeability of the glomerular filtration barrier to plasma proteins
Infiltration of the renal medulla by inflammatory cells impairing water reabsorption and concentrating ability
Obstruction of urinary outflow increasing hydrostatic pressure in Bowman's space and reducing GFR
A patient with end-stage renal disease has hyperphosphatemia and hypocalcemia. Which mechanism best explains this biochemical profile?
Increased intestinal absorption of phosphate due to dietary excess, leading to calcium precipitation in tissues
Inadequate dietary calcium intake combined with high urinary calcium excretion
Reduced GFR causing phosphate retention, which binds free calcium and lowers serum calcium levels, further worsened by decreased calcitriol synthesis
Increased parathyroid hormone production directly causing calcium loss from the kidneys
A 50-year-old man develops acute kidney injury after marathon running in extreme heat. Urinalysis shows pigmented granular casts. Which explanation best accounts for these findings?
Rapid immune-mediated destruction of glomerular capillary loops with RBC leakage
Volume depletion causing increased renin release and vasoconstriction of afferent arterioles
Rhabdomyolysis releasing myoglobin, which precipitates in the renal tubules causing obstruction and direct tubular toxicity
Hyperthermia causing ischemic injury to the renal medulla and papillae
A patient with severe bilateral hydronephrosis has a markedly reduced GFR. Which pressure change within the nephron best explains the reduced filtration?
Decreased oncotic pressure within glomerular capillaries, reducing filtration
Increased glomerular capillary hydrostatic pressure, reducing filtration
Increased hydrostatic pressure within Bowman's space opposing the glomerular filtration pressure
Increased tubular osmotic pressure drawing water back into the circulation
A patient with chronic poorly controlled hypertension develops progressive CKD. Which sequence best describes the pathophysiologic link between hypertension and nephron loss?
Systemic hypotension causing ischemic injury to the renal cortex
Activation of the sympathetic nervous system causing renal vasodilation and hyperfiltration
Chronic elevation of systemic pressure causing hyaline arteriolosclerosis of renal arterioles, ischemia of glomeruli, and eventual nephron dropout
Increased venous return leading to glomerular congestion and proteinuria
