,USU MSN 570 Week 3 Content Quiz | Advanced Pathophysiology (2026)
Q&A
1. Which of the following best describes the primary function of erythropoietin?
A) Stimulation of white blood cell production
B) Stimulation of red blood cell production
C) Regulation of platelet production
D) Regulation of iron absorption
Correct Answer: B) Stimulation of red blood cell production
Rationale: Erythropoietin is a hormone produced primarily by the kidneys that stimulates the
bone marrow to produce red blood cells. It is released in response to hypoxia and is essential
for maintaining adequate oxygen-carrying capacity.
2. A patient with chronic kidney disease presents with fatigue, pallor, and shortness of breath.
Which of the following is the most likely cause of these symptoms?
A) Iron deficiency anemia
B) Decreased erythropoietin production
C) Vitamin B12 deficiency
D) Hemolytic anemia
Correct Answer: B) Decreased erythropoietin production
Rationale: The kidneys produce erythropoietin, which stimulates red blood cell production.
In chronic kidney disease, damaged kidneys produce less erythropoietin, leading to anemia
with symptoms of fatigue, pallor, and dyspnea.
3. Which of the following laboratory findings is most consistent with iron deficiency anemia?
A) Elevated ferritin and decreased TIBC
B) Decreased ferritin and elevated TIBC
,C) Normal ferritin and normal TIBC
D) Elevated ferritin and elevated TIBC
Correct Answer: B) Decreased ferritin and elevated TIBC
Rationale: Iron deficiency anemia is characterized by low serum ferritin (reflecting depleted
iron stores) and elevated total iron-binding capacity (TIBC) as the body attempts to capture
more iron. Microcytic, hypochromic red blood cells are also seen.
4. A patient presents with jaundice, splenomegaly, and anemia. Laboratory findings reveal
elevated indirect bilirubin and reticulocytosis. Which type of anemia is most likely?
A) Iron deficiency anemia
B) Aplastic anemia
C) Hemolytic anemia
D) Megaloblastic anemia
Correct Answer: C) Hemolytic anemia
Rationale: Hemolytic anemia results from premature destruction of red blood cells, leading
to jaundice (from increased indirect bilirubin), splenomegaly, and reticulocytosis as the bone
marrow attempts to compensate.
5. Which of the following is the most common cause of aplastic anemia?
A) Autoimmune destruction of hematopoietic stem cells
B) Iron deficiency
C) Vitamin B12 deficiency
D) Chronic blood loss
Correct Answer: A) Autoimmune destruction of hematopoietic stem cells
, Rationale: Aplastic anemia is most commonly caused by autoimmune destruction of
hematopoietic stem cells in the bone marrow, leading to pancytopenia. Other causes include
toxins, radiation, and viral infections.
6. A patient with vitamin B12 deficiency presents with paresthesias and difficulty walking.
Which of the following is the underlying mechanism of these neurologic symptoms?
A) Demyelination of the spinal cord
B) Peripheral neuropathy
C) Cerebral ischemia
D) Muscle weakness
Correct Answer: A) Demyelination of the spinal cord
Rationale: Vitamin B12 deficiency causes demyelination of the dorsal and lateral columns of
the spinal cord (subacute combined degeneration), leading to paresthesias, ataxia, and
difficulty walking.
7. Which of the following laboratory findings is characteristic of folate deficiency anemia?
A) Elevated homocysteine and normal methylmalonic acid
B) Elevated homocysteine and elevated methylmalonic acid
C) Normal homocysteine and elevated methylmalonic acid
D) Normal homocysteine and normal methylmalonic acid
Correct Answer: A) Elevated homocysteine and normal methylmalonic acid
Rationale: Folate deficiency causes elevated homocysteine but normal methylmalonic acid
levels. In contrast, vitamin B12 deficiency causes elevation of both homocysteine and
methylmalonic acid.
8. A patient with sickle cell disease presents with severe pain in the hands and feet. Which of
the following is the most likely cause?
A) Vaso-occlusive crisis
Q&A
1. Which of the following best describes the primary function of erythropoietin?
A) Stimulation of white blood cell production
B) Stimulation of red blood cell production
C) Regulation of platelet production
D) Regulation of iron absorption
Correct Answer: B) Stimulation of red blood cell production
Rationale: Erythropoietin is a hormone produced primarily by the kidneys that stimulates the
bone marrow to produce red blood cells. It is released in response to hypoxia and is essential
for maintaining adequate oxygen-carrying capacity.
2. A patient with chronic kidney disease presents with fatigue, pallor, and shortness of breath.
Which of the following is the most likely cause of these symptoms?
A) Iron deficiency anemia
B) Decreased erythropoietin production
C) Vitamin B12 deficiency
D) Hemolytic anemia
Correct Answer: B) Decreased erythropoietin production
Rationale: The kidneys produce erythropoietin, which stimulates red blood cell production.
In chronic kidney disease, damaged kidneys produce less erythropoietin, leading to anemia
with symptoms of fatigue, pallor, and dyspnea.
3. Which of the following laboratory findings is most consistent with iron deficiency anemia?
A) Elevated ferritin and decreased TIBC
B) Decreased ferritin and elevated TIBC
,C) Normal ferritin and normal TIBC
D) Elevated ferritin and elevated TIBC
Correct Answer: B) Decreased ferritin and elevated TIBC
Rationale: Iron deficiency anemia is characterized by low serum ferritin (reflecting depleted
iron stores) and elevated total iron-binding capacity (TIBC) as the body attempts to capture
more iron. Microcytic, hypochromic red blood cells are also seen.
4. A patient presents with jaundice, splenomegaly, and anemia. Laboratory findings reveal
elevated indirect bilirubin and reticulocytosis. Which type of anemia is most likely?
A) Iron deficiency anemia
B) Aplastic anemia
C) Hemolytic anemia
D) Megaloblastic anemia
Correct Answer: C) Hemolytic anemia
Rationale: Hemolytic anemia results from premature destruction of red blood cells, leading
to jaundice (from increased indirect bilirubin), splenomegaly, and reticulocytosis as the bone
marrow attempts to compensate.
5. Which of the following is the most common cause of aplastic anemia?
A) Autoimmune destruction of hematopoietic stem cells
B) Iron deficiency
C) Vitamin B12 deficiency
D) Chronic blood loss
Correct Answer: A) Autoimmune destruction of hematopoietic stem cells
, Rationale: Aplastic anemia is most commonly caused by autoimmune destruction of
hematopoietic stem cells in the bone marrow, leading to pancytopenia. Other causes include
toxins, radiation, and viral infections.
6. A patient with vitamin B12 deficiency presents with paresthesias and difficulty walking.
Which of the following is the underlying mechanism of these neurologic symptoms?
A) Demyelination of the spinal cord
B) Peripheral neuropathy
C) Cerebral ischemia
D) Muscle weakness
Correct Answer: A) Demyelination of the spinal cord
Rationale: Vitamin B12 deficiency causes demyelination of the dorsal and lateral columns of
the spinal cord (subacute combined degeneration), leading to paresthesias, ataxia, and
difficulty walking.
7. Which of the following laboratory findings is characteristic of folate deficiency anemia?
A) Elevated homocysteine and normal methylmalonic acid
B) Elevated homocysteine and elevated methylmalonic acid
C) Normal homocysteine and elevated methylmalonic acid
D) Normal homocysteine and normal methylmalonic acid
Correct Answer: A) Elevated homocysteine and normal methylmalonic acid
Rationale: Folate deficiency causes elevated homocysteine but normal methylmalonic acid
levels. In contrast, vitamin B12 deficiency causes elevation of both homocysteine and
methylmalonic acid.
8. A patient with sickle cell disease presents with severe pain in the hands and feet. Which of
the following is the most likely cause?
A) Vaso-occlusive crisis
