NURS 8022 – Exam 2 (2025/2026) Advanced
Physiology and Pathophysiology Complete
Questions & Answers | ALREADY GRADED A+
SECTION 1: HEMATOLOGY – ERYTHROPOIESIS & BONE MARROW PHYSIOLOGY
1. A 70-year-old patient with chronic kidney disease (CKD) has worsening anemia. Which
physiologic process is most directly impaired?
A) Conversion of yellow marrow to red marrow
B) Differentiation of progenitor cells in the spleen
C) Fetal liver erythropoiesis
D) Mitosis of stem cells in the thymus
Answer: A
Rationale: Erythropoietin (EPO) is produced by the peritubular cells of the kidney. EPO
stimulates the conversion of yellow marrow to red marrow. In CKD, EPO production is deficient,
reducing this conversion and causing anemia. Unlike adults, fetal hematopoiesis occurs in the
liver and spleen; the spleen is not a primary site of red marrow conversion .
2. Which site is NOT typically an active bone marrow site in a healthy adult?
A) Vertebrae
B) Distal femur
C) Sternum
D) Pelvic bones
Answer: B
Rationale: Active red marrow in healthy adults is confined to the axial skeleton, including the
vertebrae, pelvis, sternum, ribs, skull, and the proximal ends of the humerus and femur. The
distal femur is usually occupied by yellow marrow (adipose tissue), which is non-hematopoietic .
3. During fetal development, hematopoiesis occurs primarily in the:
,A) Bone marrow and lymph nodes
B) Liver and spleen
C) Thymus and kidneys
D) Lungs and pancreas
Answer: B
Rationale: Fetal hematopoiesis occurs in the liver and spleen. Bone marrow does not take over
as the primary site of hematopoiesis until after birth. This is why newborns with severe anemia
may exhibit hepatosplenomegaly as the liver and spleen resume fetal hematopoietic activity .
4. A patient with severe hypoxia has a rapid increase in RBC production. Which of the
following mechanisms is the primary driver?
A) Increased differentiation of megakaryocytes
B) Faster proliferation of stem cells into progenitor cells
C) Decreased apoptosis of neutrophils
D) Conversion of red marrow to yellow marrow
Answer: B
Rationale: Hypoxia triggers the release of erythropoietin (EPO) from the kidneys. EPO acts on
the bone marrow to cause faster proliferation (mitosis) and differentiation of hematopoietic
stem cells into erythroid progenitor cells. It also stimulates the conversion of yellow marrow
back to red marrow .
5. Which statement best distinguishes red marrow from yellow marrow?
A) Red marrow produces platelets; yellow marrow produces RBCs
B) Red marrow produces RBCs; yellow marrow does not
C) Yellow marrow is found only in children
D) Yellow marrow is the primary site of erythropoietin production
Answer: B
Rationale: Red marrow is hematopoietic and is responsible for producing RBCs, WBCs, and
platelets. Yellow marrow is primarily composed of adipocytes (fat cells) and does not produce
blood cells. Yellow marrow can convert back to red marrow under conditions of chronic hypoxia
or severe blood loss .
,6. A researcher is studying factors that increase hematopoiesis. Which of the following would
they observe?
A) Conversion of red marrow to yellow marrow
B) Slower differentiation of progenitor cells
C) Faster proliferation of stem cells into progenitor cells
D) Decreased EPO levels
Answer: C
Rationale: Increased hematopoiesis involves faster proliferation (mitosis) of stem cells and
faster differentiation into progenitor cells. It also involves the conversion of yellow marrow to
red marrow, not red to yellow. EPO levels would increase, not decrease .
7. Which bone is a site of active red marrow in a healthy 30-year-old?
A) Distal radius
B) Cranium
C) Phalanges
D) Tibial shaft
Answer: B
Rationale: Active red marrow sites include the cranium, vertebrae, pelvis, sternum, ribs, and
proximal ends of the humerus and femur. The distal radius and tibial shaft are typically occupied
by yellow marrow in adults. Phalanges do not contain significant hematopoietic marrow .
8. A patient undergoing chemotherapy develops pancytopenia. This is due to suppression of:
A) Yellow marrow
B) Red marrow
C) Spleen function
D) Thymus function
Answer: B
Rationale: Pancytopenia (decrease in RBCs, WBCs, and platelets) results from suppression of the
hematopoietic stem cells located in the red marrow. Chemotherapy drugs target rapidly dividing
cells, and the bone marrow is particularly susceptible. Yellow marrow is not primarily
hematopoietic .
, 9. What is the primary site of residence of hematopoietic stem cells in adults?
A) Spleen
B) Liver
C) Bone marrow
D) Thymus
Answer: C
Rationale: The bone marrow (myeloid tissue) is the primary site of residence for hematopoietic
stem cells in adults. These pluripotent stem cells give rise to all blood cell lines: erythrocytes,
leukocytes, and thrombocytes .
10. Which of the following is the most abundant cellular component of blood?
A) Leukocytes
B) Platelets
C) Erythrocytes
D) Plasma proteins
Answer: C
Rationale: Erythrocytes (RBCs) are the most abundant cellular component of blood, accounting
for approximately 48% of blood volume in men and 42% in women (hematocrit). Leukocytes
and platelets make up less than 1% of blood volume .
11. What is the life cycle of a mature erythrocyte?
A) 30 days
B) 60 days
C) 120 days
D) 180 days
Answer: C
Rationale: Mature erythrocytes have a life span of approximately 120 days. They are incapable
of mitotic division (no nucleus). After 120 days, they are removed from circulation by the spleen
and replaced by new RBCs from the bone marrow .
Physiology and Pathophysiology Complete
Questions & Answers | ALREADY GRADED A+
SECTION 1: HEMATOLOGY – ERYTHROPOIESIS & BONE MARROW PHYSIOLOGY
1. A 70-year-old patient with chronic kidney disease (CKD) has worsening anemia. Which
physiologic process is most directly impaired?
A) Conversion of yellow marrow to red marrow
B) Differentiation of progenitor cells in the spleen
C) Fetal liver erythropoiesis
D) Mitosis of stem cells in the thymus
Answer: A
Rationale: Erythropoietin (EPO) is produced by the peritubular cells of the kidney. EPO
stimulates the conversion of yellow marrow to red marrow. In CKD, EPO production is deficient,
reducing this conversion and causing anemia. Unlike adults, fetal hematopoiesis occurs in the
liver and spleen; the spleen is not a primary site of red marrow conversion .
2. Which site is NOT typically an active bone marrow site in a healthy adult?
A) Vertebrae
B) Distal femur
C) Sternum
D) Pelvic bones
Answer: B
Rationale: Active red marrow in healthy adults is confined to the axial skeleton, including the
vertebrae, pelvis, sternum, ribs, skull, and the proximal ends of the humerus and femur. The
distal femur is usually occupied by yellow marrow (adipose tissue), which is non-hematopoietic .
3. During fetal development, hematopoiesis occurs primarily in the:
,A) Bone marrow and lymph nodes
B) Liver and spleen
C) Thymus and kidneys
D) Lungs and pancreas
Answer: B
Rationale: Fetal hematopoiesis occurs in the liver and spleen. Bone marrow does not take over
as the primary site of hematopoiesis until after birth. This is why newborns with severe anemia
may exhibit hepatosplenomegaly as the liver and spleen resume fetal hematopoietic activity .
4. A patient with severe hypoxia has a rapid increase in RBC production. Which of the
following mechanisms is the primary driver?
A) Increased differentiation of megakaryocytes
B) Faster proliferation of stem cells into progenitor cells
C) Decreased apoptosis of neutrophils
D) Conversion of red marrow to yellow marrow
Answer: B
Rationale: Hypoxia triggers the release of erythropoietin (EPO) from the kidneys. EPO acts on
the bone marrow to cause faster proliferation (mitosis) and differentiation of hematopoietic
stem cells into erythroid progenitor cells. It also stimulates the conversion of yellow marrow
back to red marrow .
5. Which statement best distinguishes red marrow from yellow marrow?
A) Red marrow produces platelets; yellow marrow produces RBCs
B) Red marrow produces RBCs; yellow marrow does not
C) Yellow marrow is found only in children
D) Yellow marrow is the primary site of erythropoietin production
Answer: B
Rationale: Red marrow is hematopoietic and is responsible for producing RBCs, WBCs, and
platelets. Yellow marrow is primarily composed of adipocytes (fat cells) and does not produce
blood cells. Yellow marrow can convert back to red marrow under conditions of chronic hypoxia
or severe blood loss .
,6. A researcher is studying factors that increase hematopoiesis. Which of the following would
they observe?
A) Conversion of red marrow to yellow marrow
B) Slower differentiation of progenitor cells
C) Faster proliferation of stem cells into progenitor cells
D) Decreased EPO levels
Answer: C
Rationale: Increased hematopoiesis involves faster proliferation (mitosis) of stem cells and
faster differentiation into progenitor cells. It also involves the conversion of yellow marrow to
red marrow, not red to yellow. EPO levels would increase, not decrease .
7. Which bone is a site of active red marrow in a healthy 30-year-old?
A) Distal radius
B) Cranium
C) Phalanges
D) Tibial shaft
Answer: B
Rationale: Active red marrow sites include the cranium, vertebrae, pelvis, sternum, ribs, and
proximal ends of the humerus and femur. The distal radius and tibial shaft are typically occupied
by yellow marrow in adults. Phalanges do not contain significant hematopoietic marrow .
8. A patient undergoing chemotherapy develops pancytopenia. This is due to suppression of:
A) Yellow marrow
B) Red marrow
C) Spleen function
D) Thymus function
Answer: B
Rationale: Pancytopenia (decrease in RBCs, WBCs, and platelets) results from suppression of the
hematopoietic stem cells located in the red marrow. Chemotherapy drugs target rapidly dividing
cells, and the bone marrow is particularly susceptible. Yellow marrow is not primarily
hematopoietic .
, 9. What is the primary site of residence of hematopoietic stem cells in adults?
A) Spleen
B) Liver
C) Bone marrow
D) Thymus
Answer: C
Rationale: The bone marrow (myeloid tissue) is the primary site of residence for hematopoietic
stem cells in adults. These pluripotent stem cells give rise to all blood cell lines: erythrocytes,
leukocytes, and thrombocytes .
10. Which of the following is the most abundant cellular component of blood?
A) Leukocytes
B) Platelets
C) Erythrocytes
D) Plasma proteins
Answer: C
Rationale: Erythrocytes (RBCs) are the most abundant cellular component of blood, accounting
for approximately 48% of blood volume in men and 42% in women (hematocrit). Leukocytes
and platelets make up less than 1% of blood volume .
11. What is the life cycle of a mature erythrocyte?
A) 30 days
B) 60 days
C) 120 days
D) 180 days
Answer: C
Rationale: Mature erythrocytes have a life span of approximately 120 days. They are incapable
of mitotic division (no nucleus). After 120 days, they are removed from circulation by the spleen
and replaced by new RBCs from the bone marrow .
