1
BIO 202L LAB 14 WORKSHEET 2026/2027 | The Urinary
System - Renal Anatomy & Urine Formation | Complete
Answers | Pass Guaranteed - A+ Graded
SECTION 1: GROSS ANATOMY OF THE KIDNEYS (Questions 1-15)
Question 1
A patient presents with right flank pain following a motor vehicle accident. The CT scan
reveals the right kidney is located at the level of the third lumbar vertebra. The left
kidney is visualized at the level of the first lumbar vertebra. The radiologist explains this
positional difference is normal anatomical variation. What is the primary anatomical
structure responsible for the lower position of the right kidney?
A. The ascending colon B. The liver C. The right adrenal gland D. The duodenum
Correct Answer: B. The liver
Rationale: The right kidney sits slightly lower than the left kidney (typically T12-L3 vs.
T11-L2) because the large right lobe of the liver displaces it inferiorly. This is a standard
anatomical relationship that students must recognize during gross anatomy
identification and clinical imaging interpretation. The liver is the largest solid organ in
the abdomen and occupies the right upper quadrant, directly superior to the right
kidney.
Question 2
During a cadaveric dissection, a student identifies a thin, fibrous layer directly
surrounding the renal parenchyma. Immediately external to this layer is a substantial
amount of adipose tissue. What is the correct identification of the fibrous layer and the
adipose layer, respectively?
,2
A. Renal fascia; adipose capsule B. Renal capsule; adipose capsule C. Adipose capsule;
renal fascia D. Renal capsule; renal fascia
Correct Answer: B. Renal capsule; adipose capsule
Rationale: The renal capsule is the thin, tough, fibrous connective tissue layer that
directly adheres to the kidney surface. External to it lies the adipose capsule (perirenal
fat), which cushions and protects the kidney. The outermost layer is the renal fascia,
which anchors the kidney to surrounding structures. Students commonly confuse the
order of these layers; the mnemonic "CAP" (Capsule, Adipose, Perirenal fascia) helps
recall the sequence from deep to superficial.
Question 3
A surgical team is performing a nephrectomy and must identify the structures entering
and exiting the kidney at the hilum. Which of the following structures is correctly
arranged from anterior to posterior at the renal hilum?
A. Renal vein, renal artery, ureter B. Renal artery, renal vein, ureter C. Ureter, renal vein,
renal artery D. Renal vein, ureter, renal artery
Correct Answer: A. Renal vein, renal artery, ureter
Rationale: At the renal hilum, the structures are arranged from anterior to posterior as:
renal vein (most anterior), renal artery, and ureter (most posterior). This is a critical
anatomical relationship for surgical approaches to prevent inadvertent ligation of the
wrong structure. The mnemonic "VAP" (Vein, Artery, Pelvis/Ureter) assists in
remembering this anterior-to-posterior arrangement.
Question 4
A histology student examining a kidney cross-section notes that the outer region
contains small, granular-appearing structures, while the inner region contains 8-18
cone-shaped structures with their bases directed toward the cortex and apices pointing
,3
toward the renal pelvis. What is the correct identification of these inner cone-shaped
structures?
A. Renal columns B. Renal pyramids C. Renal papillae D. Major calyces
Correct Answer: B. Renal pyramids
Rationale: The renal medulla contains 8-18 renal pyramids, which are cone-shaped
structures consisting primarily of parallel segments of nephron tubules and collecting
ducts. Their broad bases face the cortex, and their apices (renal papillae) project into
minor calyces. Students often confuse renal pyramids with renal columns (extensions of
cortex between pyramids) or calyces (cup-shaped collecting structures).
Question 5
A pathologist examining a kidney specimen describes "extensions of cortical tissue that
project downward between the medullary pyramids, maintaining cortical continuity."
What anatomical structure is being described?
A. Renal papillae B. Renal columns (of Bertin) C. Renal pyramids D. Minor calyces
Correct Answer: B. Renal columns (of Bertin)
Rationale: Renal columns (of Bertin) are extensions of the renal cortex that project
between adjacent renal pyramids, maintaining the cortical architecture throughout the
kidney. They contain interlobar arteries and veins. These columns are clinically
significant because hypertrophy of renal columns can be mistaken for renal tumors on
imaging. They should not be confused with the pyramids themselves, which are
medullary structures.
Question 6
During a uroradiology lecture, the instructor explains that urine formed in the nephrons
first drains into cup-shaped structures that merge into larger funnel-shaped chambers
before entering the ureter. Which sequence correctly describes this drainage pathway?
, 4
A. Minor calyces → major calyces → renal pelvis → ureter B. Major calyces → minor
calyces → renal pelvis → ureter C. Renal pelvis → major calyces → minor calyces →
ureter D. Minor calyces → renal pelvis → major calyces → ureter
Correct Answer: A. Minor calyces → major calyces → renal pelvis → ureter
Rationale: Urine drainage follows a specific hierarchical sequence: each renal papilla
drains into a minor calyx; several minor calyces merge to form a major calyx; 2-3 major
calyces unite to form the renal pelvis; the renal pelvis narrows to become the ureter.
This funnel-shaped collecting system is essential for efficient urine transport. Reversing
this sequence is a common student error during laboratory practical exams.
Question 7
A renal physiologist explains that approximately 85% of nephrons have short loops of
Henle that barely penetrate the medulla, while 15% have long loops that extend deep
into the medullary pyramids. What are the correct terms for these two nephron
populations?
A. Superficial nephrons and deep nephrons B. Cortical nephrons and juxtamedullary
nephrons C. Short-loop nephrons and long-loop nephrons D. Proximal nephrons and
distal nephrons
Correct Answer: B. Cortical nephrons and juxtamedullary nephrons
Rationale: Cortical nephrons (approximately 85%) have glomeruli located in the outer
cortex and short loops of Henle that primarily remain in the cortex or outer medulla.
Juxtamedullary nephrons (approximately 15%) have glomeruli located near the
corticomedullary junction and long loops of Henle that descend deep into the inner
medulla, creating the osmotic gradient necessary for urine concentration. This
distinction is fundamental to understanding renal concentrating ability.
Question 8
BIO 202L LAB 14 WORKSHEET 2026/2027 | The Urinary
System - Renal Anatomy & Urine Formation | Complete
Answers | Pass Guaranteed - A+ Graded
SECTION 1: GROSS ANATOMY OF THE KIDNEYS (Questions 1-15)
Question 1
A patient presents with right flank pain following a motor vehicle accident. The CT scan
reveals the right kidney is located at the level of the third lumbar vertebra. The left
kidney is visualized at the level of the first lumbar vertebra. The radiologist explains this
positional difference is normal anatomical variation. What is the primary anatomical
structure responsible for the lower position of the right kidney?
A. The ascending colon B. The liver C. The right adrenal gland D. The duodenum
Correct Answer: B. The liver
Rationale: The right kidney sits slightly lower than the left kidney (typically T12-L3 vs.
T11-L2) because the large right lobe of the liver displaces it inferiorly. This is a standard
anatomical relationship that students must recognize during gross anatomy
identification and clinical imaging interpretation. The liver is the largest solid organ in
the abdomen and occupies the right upper quadrant, directly superior to the right
kidney.
Question 2
During a cadaveric dissection, a student identifies a thin, fibrous layer directly
surrounding the renal parenchyma. Immediately external to this layer is a substantial
amount of adipose tissue. What is the correct identification of the fibrous layer and the
adipose layer, respectively?
,2
A. Renal fascia; adipose capsule B. Renal capsule; adipose capsule C. Adipose capsule;
renal fascia D. Renal capsule; renal fascia
Correct Answer: B. Renal capsule; adipose capsule
Rationale: The renal capsule is the thin, tough, fibrous connective tissue layer that
directly adheres to the kidney surface. External to it lies the adipose capsule (perirenal
fat), which cushions and protects the kidney. The outermost layer is the renal fascia,
which anchors the kidney to surrounding structures. Students commonly confuse the
order of these layers; the mnemonic "CAP" (Capsule, Adipose, Perirenal fascia) helps
recall the sequence from deep to superficial.
Question 3
A surgical team is performing a nephrectomy and must identify the structures entering
and exiting the kidney at the hilum. Which of the following structures is correctly
arranged from anterior to posterior at the renal hilum?
A. Renal vein, renal artery, ureter B. Renal artery, renal vein, ureter C. Ureter, renal vein,
renal artery D. Renal vein, ureter, renal artery
Correct Answer: A. Renal vein, renal artery, ureter
Rationale: At the renal hilum, the structures are arranged from anterior to posterior as:
renal vein (most anterior), renal artery, and ureter (most posterior). This is a critical
anatomical relationship for surgical approaches to prevent inadvertent ligation of the
wrong structure. The mnemonic "VAP" (Vein, Artery, Pelvis/Ureter) assists in
remembering this anterior-to-posterior arrangement.
Question 4
A histology student examining a kidney cross-section notes that the outer region
contains small, granular-appearing structures, while the inner region contains 8-18
cone-shaped structures with their bases directed toward the cortex and apices pointing
,3
toward the renal pelvis. What is the correct identification of these inner cone-shaped
structures?
A. Renal columns B. Renal pyramids C. Renal papillae D. Major calyces
Correct Answer: B. Renal pyramids
Rationale: The renal medulla contains 8-18 renal pyramids, which are cone-shaped
structures consisting primarily of parallel segments of nephron tubules and collecting
ducts. Their broad bases face the cortex, and their apices (renal papillae) project into
minor calyces. Students often confuse renal pyramids with renal columns (extensions of
cortex between pyramids) or calyces (cup-shaped collecting structures).
Question 5
A pathologist examining a kidney specimen describes "extensions of cortical tissue that
project downward between the medullary pyramids, maintaining cortical continuity."
What anatomical structure is being described?
A. Renal papillae B. Renal columns (of Bertin) C. Renal pyramids D. Minor calyces
Correct Answer: B. Renal columns (of Bertin)
Rationale: Renal columns (of Bertin) are extensions of the renal cortex that project
between adjacent renal pyramids, maintaining the cortical architecture throughout the
kidney. They contain interlobar arteries and veins. These columns are clinically
significant because hypertrophy of renal columns can be mistaken for renal tumors on
imaging. They should not be confused with the pyramids themselves, which are
medullary structures.
Question 6
During a uroradiology lecture, the instructor explains that urine formed in the nephrons
first drains into cup-shaped structures that merge into larger funnel-shaped chambers
before entering the ureter. Which sequence correctly describes this drainage pathway?
, 4
A. Minor calyces → major calyces → renal pelvis → ureter B. Major calyces → minor
calyces → renal pelvis → ureter C. Renal pelvis → major calyces → minor calyces →
ureter D. Minor calyces → renal pelvis → major calyces → ureter
Correct Answer: A. Minor calyces → major calyces → renal pelvis → ureter
Rationale: Urine drainage follows a specific hierarchical sequence: each renal papilla
drains into a minor calyx; several minor calyces merge to form a major calyx; 2-3 major
calyces unite to form the renal pelvis; the renal pelvis narrows to become the ureter.
This funnel-shaped collecting system is essential for efficient urine transport. Reversing
this sequence is a common student error during laboratory practical exams.
Question 7
A renal physiologist explains that approximately 85% of nephrons have short loops of
Henle that barely penetrate the medulla, while 15% have long loops that extend deep
into the medullary pyramids. What are the correct terms for these two nephron
populations?
A. Superficial nephrons and deep nephrons B. Cortical nephrons and juxtamedullary
nephrons C. Short-loop nephrons and long-loop nephrons D. Proximal nephrons and
distal nephrons
Correct Answer: B. Cortical nephrons and juxtamedullary nephrons
Rationale: Cortical nephrons (approximately 85%) have glomeruli located in the outer
cortex and short loops of Henle that primarily remain in the cortex or outer medulla.
Juxtamedullary nephrons (approximately 15%) have glomeruli located near the
corticomedullary junction and long loops of Henle that descend deep into the inner
medulla, creating the osmotic gradient necessary for urine concentration. This
distinction is fundamental to understanding renal concentrating ability.
Question 8
