NR 507 Advanced Pathophysiology Week 4
Exam: Urinary System Pathologies and Urinary
Tract Infections 100 Questions with Answers
and Rationales
SECTION A: Anatomy and Physiology Review (Questions 1-
15)
1. The functional unit of the kidney is the:
A) Glomerulus
B) Nephron
C) Renal corpuscle
D) Collecting duct
Correct Answer: B) Nephron
Expert Rationale: The nephron is the functional unit of the kidney
responsible for filtering blood and forming urine. Each kidney
contains approximately 1 million nephrons. The glomerulus is part
of the nephron, and the collecting duct receives urine from multiple
nephrons .
2. The glomerulus is a network of capillaries located between
which two arterioles?
A) Renal artery and renal vein
B) Afferent arteriole and efferent arteriole
,C) Interlobular artery and arcuate artery
D) Peritubular capillaries and vasa recta
Correct Answer: B) Afferent arteriole and efferent arteriole
Expert Rationale: The glomerulus is a unique capillary network
situated between the afferent arteriole (incoming) and the efferent
arteriole (outgoing). This arrangement allows for high-pressure
filtration of blood .
3. The glomerular filtration barrier consists of:
A) Fenestrated endothelium, basement membrane, and podocyte
filtration slits
B) Smooth muscle and elastic fibers
C) Simple squamous epithelium only
D) Transitional epithelium
Correct Answer: A) Fenestrated endothelium, basement
membrane, and podocyte filtration slits
Expert Rationale: The glomerular filtration barrier has three
layers: the fenestrated glomerular endothelium, the basement
membrane, and the podocyte filtration slits (formed by podocyte
foot processes). This structure allows small molecules to pass while
blocking larger molecules .
4. What is the normal glomerular filtration rate (GFR) in a
healthy adult?
,A) 50 mL/min
B) 125 mL/min
C) 200 mL/min
D) 500 mL/min
Correct Answer: B) 125 mL/min
Expert Rationale: Normal GFR is approximately 125 mL/min (or
180 L/day). This is the volume of filtrate formed by both kidneys per
minute. Only about 1% of this filtrate becomes urine (1-2 L/day) .
5. The juxtaglomerular apparatus (JGA) is responsible for:
A) Filtration of blood
B) Regulation of blood pressure via renin secretion
C) Reabsorption of glucose
D) Concentration of urine
Correct Answer: B) Regulation of blood pressure via renin
secretion
Expert Rationale: The JGA is located where the distal convoluted
tubule contacts the afferent arteriole. It secretes renin in response
to decreased blood pressure, decreased sodium delivery to the
macula densa, or sympathetic stimulation, initiating the RAAS .
6. Which hormone is produced by the kidneys and stimulates
red blood cell production?
, A) Aldosterone
B) Renin
C) Erythropoietin
D) Antidiuretic hormone
Correct Answer: C) Erythropoietin
Expert Rationale: Erythropoietin (EPO) is produced by the kidneys
(peritubular interstitial cells) in response to hypoxia. It stimulates
the bone marrow to increase red blood cell production. Chronic
kidney disease leads to anemia due to decreased EPO production .
7. The countercurrent multiplier mechanism in the kidney
occurs in the:
A) Proximal convoluted tubule
B) Loop of Henle
C) Distal convoluted tubule
D) Collecting duct
Correct Answer: B) Loop of Henle
Expert Rationale: The countercurrent multiplier in the loop of Henle
establishes and maintains a concentration gradient in the renal
medulla. The descending limb is permeable to water but not salt,
while the ascending limb actively transports salt but is
impermeable to water .
8. Antidiuretic hormone (ADH) acts on which structure to
increase water reabsorption?
Exam: Urinary System Pathologies and Urinary
Tract Infections 100 Questions with Answers
and Rationales
SECTION A: Anatomy and Physiology Review (Questions 1-
15)
1. The functional unit of the kidney is the:
A) Glomerulus
B) Nephron
C) Renal corpuscle
D) Collecting duct
Correct Answer: B) Nephron
Expert Rationale: The nephron is the functional unit of the kidney
responsible for filtering blood and forming urine. Each kidney
contains approximately 1 million nephrons. The glomerulus is part
of the nephron, and the collecting duct receives urine from multiple
nephrons .
2. The glomerulus is a network of capillaries located between
which two arterioles?
A) Renal artery and renal vein
B) Afferent arteriole and efferent arteriole
,C) Interlobular artery and arcuate artery
D) Peritubular capillaries and vasa recta
Correct Answer: B) Afferent arteriole and efferent arteriole
Expert Rationale: The glomerulus is a unique capillary network
situated between the afferent arteriole (incoming) and the efferent
arteriole (outgoing). This arrangement allows for high-pressure
filtration of blood .
3. The glomerular filtration barrier consists of:
A) Fenestrated endothelium, basement membrane, and podocyte
filtration slits
B) Smooth muscle and elastic fibers
C) Simple squamous epithelium only
D) Transitional epithelium
Correct Answer: A) Fenestrated endothelium, basement
membrane, and podocyte filtration slits
Expert Rationale: The glomerular filtration barrier has three
layers: the fenestrated glomerular endothelium, the basement
membrane, and the podocyte filtration slits (formed by podocyte
foot processes). This structure allows small molecules to pass while
blocking larger molecules .
4. What is the normal glomerular filtration rate (GFR) in a
healthy adult?
,A) 50 mL/min
B) 125 mL/min
C) 200 mL/min
D) 500 mL/min
Correct Answer: B) 125 mL/min
Expert Rationale: Normal GFR is approximately 125 mL/min (or
180 L/day). This is the volume of filtrate formed by both kidneys per
minute. Only about 1% of this filtrate becomes urine (1-2 L/day) .
5. The juxtaglomerular apparatus (JGA) is responsible for:
A) Filtration of blood
B) Regulation of blood pressure via renin secretion
C) Reabsorption of glucose
D) Concentration of urine
Correct Answer: B) Regulation of blood pressure via renin
secretion
Expert Rationale: The JGA is located where the distal convoluted
tubule contacts the afferent arteriole. It secretes renin in response
to decreased blood pressure, decreased sodium delivery to the
macula densa, or sympathetic stimulation, initiating the RAAS .
6. Which hormone is produced by the kidneys and stimulates
red blood cell production?
, A) Aldosterone
B) Renin
C) Erythropoietin
D) Antidiuretic hormone
Correct Answer: C) Erythropoietin
Expert Rationale: Erythropoietin (EPO) is produced by the kidneys
(peritubular interstitial cells) in response to hypoxia. It stimulates
the bone marrow to increase red blood cell production. Chronic
kidney disease leads to anemia due to decreased EPO production .
7. The countercurrent multiplier mechanism in the kidney
occurs in the:
A) Proximal convoluted tubule
B) Loop of Henle
C) Distal convoluted tubule
D) Collecting duct
Correct Answer: B) Loop of Henle
Expert Rationale: The countercurrent multiplier in the loop of Henle
establishes and maintains a concentration gradient in the renal
medulla. The descending limb is permeable to water but not salt,
while the ascending limb actively transports salt but is
impermeable to water .
8. Antidiuretic hormone (ADH) acts on which structure to
increase water reabsorption?
