BIOD 331 Module 5 Exam Portage Learning Questions and
Answers 2026
BIOD 331 Module 5 Hemostasis (Blood Clotting) and Red Blood Cell Disorders.
1. Which of the following is the first step in the process of hemostasis?
A) Platelet plug formation
B) Blood coagulation (clotting)
C) Vessel spasm (Vasoconstriction)
D) Clot retraction
Answer: C
Rationale: Immediate vasoconstriction reduces blood flow to the injured area to
minimize loss.
2. Which vitamin is a required cofactor for the synthesis of many clotting factors
(II, VII, IX, X)?
A) Vitamin C
B) Vitamin D
C) Vitamin K
D) Vitamin E
Answer: C
Rationale: Vitamin K is essential for the liver to produce functional clotting proteins.
3. "Thrombocytopenia" refers to:
A) Too many red blood cells.
B) A decrease in the number of circulating platelets (<150,000/µL).
C) High white blood cell count.
D) Thickening of the blood.
Answer: B
Rationale: Low platelet counts significantly increase the risk of spontaneous bleeding.
4. Which organ produces "Erythropoietin" in response to low oxygen levels
(hypoxia)?
A) Liver
B) Spleen
,C) Kidneys
D) Bone Marrow
Answer: C
Rationale: The kidneys sense low oxygen and release erythropoietin to stimulate RBC
production.
5. "Iron Deficiency Anemia" is characterized by cells that are:
A) Macrocytic and Hyperchromic.
B) Microcytic and Hypochromic.
C) Normocytic and Normochromic.
D) Large and blue.
Answer: B
Rationale: Without iron, hemoglobin cannot form properly, resulting in small (microcytic)
and pale (hypochromic) cells.
6. "Sickle Cell Disease" is caused by a genetic mutation in the:
A) Platelets.
B) Hemoglobin molecule (HbS).
C) White blood cells.
D) Plasma proteins.
Answer: B
Rationale: Under low oxygen conditions, the HbS molecule polymerizes, causing the
RBC to "sickle."
7. Which of the following is a classic symptom of "Hemolytic Anemia"?
A) High blood pressure
B) Jaundice (icterus)
C) Increased hair growth
D) Weight gain
Answer: B
Rationale: Rapid destruction of RBCs releases excess heme, which is converted to
bilirubin, causing yellowing of the skin.
8. "Pernicious Anemia" is caused by a lack of ______ which is needed to absorb
Vitamin B12.
A) Iron
B) Intrinsic Factor
C) Folate
D) Calcium
Answer: B
, Rationale: Intrinsic factor, produced in the stomach, is required for B12 absorption in the
ileum.
9. "Von Willebrand Disease" is a disorder of:
A) Red blood cell shape.
B) Platelet adhesion to the vessel wall.
C) Vitamin D deficiency.
D) High cholesterol.
Answer: B
Rationale: vWF acts as a "bridge" between platelets and the injured vessel wall.
10. What is the lifespan of a typical mature Red Blood Cell?
A) 10 days
B) 30 days
C) 120 days
D) 1 year
Answer: C
Rationale: After roughly 120 days, RBCs are broken down by the spleen.
11. "Aplastic Anemia" involves the failure of:
A) The kidneys to produce erythropoietin.
B) The bone marrow to produce all three types of blood cells (Pancytopenia).
C) The liver to produce bile.
D) The heart to pump blood.
Answer: B
Rationale: It is a bone marrow "shutdown" often caused by toxins, radiation, or certain
drugs.
12. Which mineral is at the center of the "Heme" group and binds to oxygen?
A) Magnesium
B) Sodium
C) Iron
D) Zinc
Answer: C
Rationale: Each hemoglobin molecule contains four iron atoms that carry oxygen.
13. "Polycythemia Vera" is a condition characterized by:
A) Too few red blood cells.
B) An overproduction of red blood cells, increasing blood viscosity.
C) A lack of platelets.
D) Low hemoglobin.
Answers 2026
BIOD 331 Module 5 Hemostasis (Blood Clotting) and Red Blood Cell Disorders.
1. Which of the following is the first step in the process of hemostasis?
A) Platelet plug formation
B) Blood coagulation (clotting)
C) Vessel spasm (Vasoconstriction)
D) Clot retraction
Answer: C
Rationale: Immediate vasoconstriction reduces blood flow to the injured area to
minimize loss.
2. Which vitamin is a required cofactor for the synthesis of many clotting factors
(II, VII, IX, X)?
A) Vitamin C
B) Vitamin D
C) Vitamin K
D) Vitamin E
Answer: C
Rationale: Vitamin K is essential for the liver to produce functional clotting proteins.
3. "Thrombocytopenia" refers to:
A) Too many red blood cells.
B) A decrease in the number of circulating platelets (<150,000/µL).
C) High white blood cell count.
D) Thickening of the blood.
Answer: B
Rationale: Low platelet counts significantly increase the risk of spontaneous bleeding.
4. Which organ produces "Erythropoietin" in response to low oxygen levels
(hypoxia)?
A) Liver
B) Spleen
,C) Kidneys
D) Bone Marrow
Answer: C
Rationale: The kidneys sense low oxygen and release erythropoietin to stimulate RBC
production.
5. "Iron Deficiency Anemia" is characterized by cells that are:
A) Macrocytic and Hyperchromic.
B) Microcytic and Hypochromic.
C) Normocytic and Normochromic.
D) Large and blue.
Answer: B
Rationale: Without iron, hemoglobin cannot form properly, resulting in small (microcytic)
and pale (hypochromic) cells.
6. "Sickle Cell Disease" is caused by a genetic mutation in the:
A) Platelets.
B) Hemoglobin molecule (HbS).
C) White blood cells.
D) Plasma proteins.
Answer: B
Rationale: Under low oxygen conditions, the HbS molecule polymerizes, causing the
RBC to "sickle."
7. Which of the following is a classic symptom of "Hemolytic Anemia"?
A) High blood pressure
B) Jaundice (icterus)
C) Increased hair growth
D) Weight gain
Answer: B
Rationale: Rapid destruction of RBCs releases excess heme, which is converted to
bilirubin, causing yellowing of the skin.
8. "Pernicious Anemia" is caused by a lack of ______ which is needed to absorb
Vitamin B12.
A) Iron
B) Intrinsic Factor
C) Folate
D) Calcium
Answer: B
, Rationale: Intrinsic factor, produced in the stomach, is required for B12 absorption in the
ileum.
9. "Von Willebrand Disease" is a disorder of:
A) Red blood cell shape.
B) Platelet adhesion to the vessel wall.
C) Vitamin D deficiency.
D) High cholesterol.
Answer: B
Rationale: vWF acts as a "bridge" between platelets and the injured vessel wall.
10. What is the lifespan of a typical mature Red Blood Cell?
A) 10 days
B) 30 days
C) 120 days
D) 1 year
Answer: C
Rationale: After roughly 120 days, RBCs are broken down by the spleen.
11. "Aplastic Anemia" involves the failure of:
A) The kidneys to produce erythropoietin.
B) The bone marrow to produce all three types of blood cells (Pancytopenia).
C) The liver to produce bile.
D) The heart to pump blood.
Answer: B
Rationale: It is a bone marrow "shutdown" often caused by toxins, radiation, or certain
drugs.
12. Which mineral is at the center of the "Heme" group and binds to oxygen?
A) Magnesium
B) Sodium
C) Iron
D) Zinc
Answer: C
Rationale: Each hemoglobin molecule contains four iron atoms that carry oxygen.
13. "Polycythemia Vera" is a condition characterized by:
A) Too few red blood cells.
B) An overproduction of red blood cells, increasing blood viscosity.
C) A lack of platelets.
D) Low hemoglobin.
