BIOS 251 Week 7 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which part of the nephron is responsible for the majority of
solute and water reabsorption?
A. Proximal tubule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct answer: A
Rationale: The proximal tubule reabsorbs ~65% of filtered water
and sodium and almost all filtered glucose.
2. Which hormone primarily increases water reabsorption in the
collecting duct?
A. Aldosterone
B. ADH
,C. ANP
D. Renin
Correct answer: B
Rationale: ADH increases aquaporin insertion in the collecting duct
to conserve water.
3. Which nephron segment is impermeable to water but actively
reabsorbs ions?
A. Descending Loop of Henle
B. Ascending Loop of Henle
C. Proximal tubule
D. Collecting duct
Correct answer: B
Rationale: The ascending limb of the Loop of Henle reabsorbs Na+,
K+, and Cl− but does not allow water passage.
4. Which hormone promotes sodium reabsorption and potassium
excretion in the distal nephron?
A. ADH
B. Aldosterone
C. ANP
D. Angiotensin II
,Correct answer: B
Rationale: Aldosterone acts on distal tubules and collecting ducts to
maintain electrolyte balance.
5. Which hormone is secreted in response to high atrial pressure
to reduce blood volume?
A. ADH
B. ANP
C. Aldosterone
D. Renin
Correct answer: B
Rationale: ANP promotes natriuresis and diuresis to lower blood
volume and pressure.
6. Which hormone stimulates renin secretion?
A. High sodium
B. Low blood pressure
C. Low potassium
D. ANP
Correct answer: B
Rationale: Renin is released from juxtaglomerular cells in response
to low BP.
7. Which nephron segment establishes the medullary osmotic
gradient?
, A. Proximal tubule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct answer: B
Rationale: Countercurrent multiplication in Loop of Henle
concentrates the medullary interstitium.
8. Which hormone is released in response to increased plasma
osmolarity?
A. ADH
B. Aldosterone
C. ANP
D. Renin
Correct answer: A
Rationale: ADH conserves water by increasing collecting duct
permeability.
9. Which hormone stimulates potassium secretion in exchange for
sodium in distal nephron?
A. ADH
B. Aldosterone
C. ANP
D. Angiotensin II
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which part of the nephron is responsible for the majority of
solute and water reabsorption?
A. Proximal tubule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct answer: A
Rationale: The proximal tubule reabsorbs ~65% of filtered water
and sodium and almost all filtered glucose.
2. Which hormone primarily increases water reabsorption in the
collecting duct?
A. Aldosterone
B. ADH
,C. ANP
D. Renin
Correct answer: B
Rationale: ADH increases aquaporin insertion in the collecting duct
to conserve water.
3. Which nephron segment is impermeable to water but actively
reabsorbs ions?
A. Descending Loop of Henle
B. Ascending Loop of Henle
C. Proximal tubule
D. Collecting duct
Correct answer: B
Rationale: The ascending limb of the Loop of Henle reabsorbs Na+,
K+, and Cl− but does not allow water passage.
4. Which hormone promotes sodium reabsorption and potassium
excretion in the distal nephron?
A. ADH
B. Aldosterone
C. ANP
D. Angiotensin II
,Correct answer: B
Rationale: Aldosterone acts on distal tubules and collecting ducts to
maintain electrolyte balance.
5. Which hormone is secreted in response to high atrial pressure
to reduce blood volume?
A. ADH
B. ANP
C. Aldosterone
D. Renin
Correct answer: B
Rationale: ANP promotes natriuresis and diuresis to lower blood
volume and pressure.
6. Which hormone stimulates renin secretion?
A. High sodium
B. Low blood pressure
C. Low potassium
D. ANP
Correct answer: B
Rationale: Renin is released from juxtaglomerular cells in response
to low BP.
7. Which nephron segment establishes the medullary osmotic
gradient?
, A. Proximal tubule
B. Loop of Henle
C. Distal tubule
D. Collecting duct
Correct answer: B
Rationale: Countercurrent multiplication in Loop of Henle
concentrates the medullary interstitium.
8. Which hormone is released in response to increased plasma
osmolarity?
A. ADH
B. Aldosterone
C. ANP
D. Renin
Correct answer: A
Rationale: ADH conserves water by increasing collecting duct
permeability.
9. Which hormone stimulates potassium secretion in exchange for
sodium in distal nephron?
A. ADH
B. Aldosterone
C. ANP
D. Angiotensin II
