ATI RN
Urinary System Exam Questions Questions 
            
        Question 1 of 5
Identify the blood components that cannot be filtered by the glomerulus.
Correct Answer: A
Rationale: Formed elements (RBCs, WBCs, platelets) and plasma proteins (e.g., albumin) can't filter too large for glomerular barrier. Glucose filters reabsorbed later. Salts filter freely small ions. Formed elements/glucose mispairs glucose filters. Proteins/salts mix filterable/non-filterable wrong. Size exclusion distinguishes it, key to filtration selectivity, unlike mixed options.
Question 2 of 5
The presence of ADH will cause
Correct Answer: B
Rationale: ADH decreases urine production inserts aquaporins, reabsorbs water (e.g., concentrated urine). Increased production opposes diuresis. No change ignores ADH false. Dilute misaligns ADH concentrates. Reduced output distinguishes it, critical for osmoregulation, unlike diuresis or neutral effects.
Question 3 of 5
The most important blood buffer is
Correct Answer: C
Rationale: Carbonic acid (Hâ‚‚CO₃) and bicarbonate (HCO₃â») are the key blood buffer e.g., Hâ‚‚CO₃ ↔ H + HCO₃⻠(H-H equation). Water alone doesn't buffer neutral. COâ‚‚/HCO₃⻠lacks acid form partial. HCO₃â»/water omits dynamic weak. Hâ‚‚CO₃/HCO₃⻠pair distinguishes it, critical for pH control, unlike incomplete sets.
Question 4 of 5
What is the yellow pigment in urine called?
Correct Answer: C
Rationale: Urochrome is urine's yellow pigment bilirubin breakdown (e.g., normal color). Hemoglobin is blood abnormal in urine. Urea is waste colorless. Uroglobin isn't a term false. Urochrome's pigment role distinguishes it, critical for urine appearance, unlike blood, waste, or nonexistent options.
Question 5 of 5
Which of the following does not tend to increase osmolality in the medullary interstitial fluid?
Correct Answer: D
Rationale: Osmosis moves water not ions into interstitium, diluting osmolality (e.g., passive water flow). Active ion transport (ascending Loop) increases osmolality true. Urea diffusion from ducts adds solutes correct. Na /Clâ» transport boosts gradient valid. Osmosis's dilution distinguishes it, key to countercurrent dynamics, unlike solute-adding mechanisms.
