NURS 231/NURS231 Module 4 V1 |
Pathophysiology Q&A with Rationale | Portage
Learning
1. Which of the following conditions is characterized by a deficiency in the Intrinsic Factor,
leading to a failure in Vitamin B12 absorption?
A. Iron Deficiency Anemia
B. Aplastic Anemia
C. Pernicious Anemia
D. Sickle Cell Anemia
Correct Answer: C
Explanation: Pernicious anemia is a specific type of megaloblastic anemia caused by the
lack of intrinsic factor, which is secreted by the gastric parietal cells. Without intrinsic
factor, the body cannot absorb Vitamin B12 in the ileum. This leads to impaired DNA
synthesis in red blood cells and neurologic complications if left untreated.
2. A patient presents with a hemoglobin of 8 g/dL and a Mean Corpuscular Volume (MCV) of
72 fL. Which diagnosis is most likely?
A. Iron Deficiency Anemia
B. Vitamin B12 Deficiency
C. Folic Acid Deficiency
,D. Hemolytic Anemia
Correct Answer: A
Explanation: Iron deficiency anemia is classified as a microcytic, hypochromic anemia,
which is indicated by a low MCV (below 80 fL). In this condition, the lack of iron prevents
the synthesis of adequate hemoglobin, resulting in smaller, paler red blood cells. Chronic
blood loss is a common cause of this condition in adults.
3. Which hormone, produced by the kidneys, is the primary stimulus for the production of red
blood cells in the bone marrow?
A. Erythropoietin
B. Thrombopoietin
C. Aldosterone
D. Renin
Correct Answer: A
Explanation: Erythropoietin (EPO) is a hormone released by the kidneys in response to
hypoxia or low oxygen levels in the blood. EPO travels to the bone marrow where it
stimulates the differentiation of hematopoietic stem cells into erythrocytes. This
mechanism ensures that red blood cell mass is maintained for adequate oxygen transport.
4. What is the primary pathophysiology behind the sickling of red blood cells in Sickle Cell
Disease?
A. A deficiency in the alpha-globin chain
, B. The presence of abnormal Hemoglobin S (HbS)
C. Autoimmune destruction of the cell membrane
D. Excessive iron accumulation in the cell
Correct Answer: B
Explanation: Sickle cell disease is caused by a point mutation in the beta-globin chain,
resulting in the production of Hemoglobin S. When HbS is exposed to deoxygenated
conditions, it polymerizes and causes the red blood cell to take on a rigid, sickle shape. This
leads to vascular occlusion, tissue ischemia, and chronic hemolytic anemia.
5. Which stage of hemostasis involves the conversion of fibrinogen into fibrin to stabilize a
blood clot?
A. Blood coagulation (Coagulation Cascade)
B. Platelet plug formation
C. Vessel spasm
D. Clot retraction
Correct Answer: A
Explanation: Blood coagulation is the third stage of hemostasis where the coagulation
cascade is activated through either the intrinsic or extrinsic pathways. The final common
pathway involves the conversion of prothrombin to thrombin, which then converts
Pathophysiology Q&A with Rationale | Portage
Learning
1. Which of the following conditions is characterized by a deficiency in the Intrinsic Factor,
leading to a failure in Vitamin B12 absorption?
A. Iron Deficiency Anemia
B. Aplastic Anemia
C. Pernicious Anemia
D. Sickle Cell Anemia
Correct Answer: C
Explanation: Pernicious anemia is a specific type of megaloblastic anemia caused by the
lack of intrinsic factor, which is secreted by the gastric parietal cells. Without intrinsic
factor, the body cannot absorb Vitamin B12 in the ileum. This leads to impaired DNA
synthesis in red blood cells and neurologic complications if left untreated.
2. A patient presents with a hemoglobin of 8 g/dL and a Mean Corpuscular Volume (MCV) of
72 fL. Which diagnosis is most likely?
A. Iron Deficiency Anemia
B. Vitamin B12 Deficiency
C. Folic Acid Deficiency
,D. Hemolytic Anemia
Correct Answer: A
Explanation: Iron deficiency anemia is classified as a microcytic, hypochromic anemia,
which is indicated by a low MCV (below 80 fL). In this condition, the lack of iron prevents
the synthesis of adequate hemoglobin, resulting in smaller, paler red blood cells. Chronic
blood loss is a common cause of this condition in adults.
3. Which hormone, produced by the kidneys, is the primary stimulus for the production of red
blood cells in the bone marrow?
A. Erythropoietin
B. Thrombopoietin
C. Aldosterone
D. Renin
Correct Answer: A
Explanation: Erythropoietin (EPO) is a hormone released by the kidneys in response to
hypoxia or low oxygen levels in the blood. EPO travels to the bone marrow where it
stimulates the differentiation of hematopoietic stem cells into erythrocytes. This
mechanism ensures that red blood cell mass is maintained for adequate oxygen transport.
4. What is the primary pathophysiology behind the sickling of red blood cells in Sickle Cell
Disease?
A. A deficiency in the alpha-globin chain
, B. The presence of abnormal Hemoglobin S (HbS)
C. Autoimmune destruction of the cell membrane
D. Excessive iron accumulation in the cell
Correct Answer: B
Explanation: Sickle cell disease is caused by a point mutation in the beta-globin chain,
resulting in the production of Hemoglobin S. When HbS is exposed to deoxygenated
conditions, it polymerizes and causes the red blood cell to take on a rigid, sickle shape. This
leads to vascular occlusion, tissue ischemia, and chronic hemolytic anemia.
5. Which stage of hemostasis involves the conversion of fibrinogen into fibrin to stabilize a
blood clot?
A. Blood coagulation (Coagulation Cascade)
B. Platelet plug formation
C. Vessel spasm
D. Clot retraction
Correct Answer: A
Explanation: Blood coagulation is the third stage of hemostasis where the coagulation
cascade is activated through either the intrinsic or extrinsic pathways. The final common
pathway involves the conversion of prothrombin to thrombin, which then converts
