2026/2027
BIOL 251 Human Anatomy &
Physiology 1 Module 3 Exam
Complete Lecture-Based Review and
Assessment Practice Guide
2026/2027
Question 1:
A patient is diagnosed with anemia caused by a genetic defect that produces abnormal
hemoglobin. Which condition is most likely present?
A. Hemorrhagic anemia
B. Aplastic anemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: D. Sickle cell anemia
Rationale: Sickle cell anemia is a hereditary disorder caused by a mutation in the
hemoglobin gene, leading to abnormal, crescent-shaped red blood cells that obstruct
blood flow and reduce oxygen delivery. Hemorrhagic anemia results from blood loss,
aplastic anemia from bone marrow failure, and pernicious anemia from vitamin B12
deficiency affecting RBC production.
Question 2:
Which white blood cell is primarily responsible for defending the body against
parasitic infections?
A. Erythrocyte
B. Basophil
C. Neutrophil
D. Lymphocyte
E. Eosinophil
Correct Answer: E. Eosinophil
Rationale: Eosinophils play a major role in combating parasitic infections and are also
involved in allergic responses. Neutrophils primarily target bacteria, lymphocytes
regulate adaptive immunity, basophils release histamine in allergic reactions, and
erythrocytes transport oxygen.
,2026/2027
Question 3:
Blood clotting depends primarily on which vitamin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin K
E. Vitamin C
Correct Answer: D. Vitamin K
Rationale: Vitamin K is essential for the synthesis of clotting factors in the liver,
including prothrombin. Without it, proper coagulation cannot occur. Other vitamins
play roles in vision (A), calcium regulation (D), antioxidant protection (E), and
cellular protection (E), but not clotting.
Question 4:
Which blood cell is directly responsible for clot formation?
A. Erythrocyte
B. Basophil
C. Neutrophil
D. Thrombocyte
E. Eosinophil
Correct Answer: D. Thrombocyte
Rationale: Thrombocytes, also known as platelets, are responsible for initiating blood
clot formation by aggregating at injury sites. Red blood cells transport oxygen, while
white blood cells such as basophils, neutrophils, and eosinophils function in immunity
rather than clotting.
Question 5:
An abnormally increased number of red blood cells is known as:
A. Hemorrhagic anemia
B. Polycythemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: B. Polycythemia
Rationale: Polycythemia is characterized by excessive red blood cell production,
increasing blood viscosity and risk of thrombosis. Anemia conditions involve reduced
,2026/2027
RBCs or hemoglobin, while sickle cell anemia involves structural defects in
hemoglobin rather than increased cell numbers.
Question 6:
Destruction or failure of bone marrow leading to decreased blood cell production is
called:
A. Hemorrhagic anemia
B. Aplastic anemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: B. Aplastic anemia
Rationale: Aplastic anemia occurs when bone marrow fails to produce sufficient
blood cells, often due to toxins, drugs, or autoimmune damage. Other forms of anemia
involve blood loss, vitamin deficiency, or hemoglobin abnormalities rather than
marrow failure.
Question 7:
Anemia is best defined as:
A. Excess red blood cell production
B. Inability of blood to carry sufficient oxygen
C. Excess white blood cells
D. Excess clotting factors
Correct Answer: B. Inability of blood to carry sufficient oxygen
Rationale: Anemia refers to a reduced oxygen-carrying capacity of blood, usually due
to low hemoglobin or RBC count. It is not defined by increased cells or clotting
factors but by impaired oxygen delivery to tissues.
Question 8:
Rh incompatibility between mother and fetus can lead to:
A. Sickle cell anemia
B. Erythroblastosis fetalis
C. Iron deficiency anemia
D. Leukocytosis
Correct Answer: B. Erythroblastosis fetalis
, 2026/2027
Rationale: This condition occurs when an Rh-negative mother develops antibodies
against Rh-positive fetal red blood cells, leading to hemolysis. Other options represent
unrelated hematological disorders.
Question 9:
Blood without formed elements and clotting factors is called:
A. Albumin
B. Serum
C. Plasma
D. Globulin
Correct Answer: B. Serum
Rationale: Serum is plasma without clotting factors such as fibrinogen. Plasma
contains clotting proteins, while albumin and globulins are specific plasma proteins
rather than whole fluid components.
Question 10:
The universal donor blood type in the ABO system is:
A. Type A
B. Type B
C. Type AB
D. Type O
Correct Answer: D. Type O
Rationale: Type O blood lacks A and B antigens, making it compatible with all ABO
blood types for red cell transfusion. Type AB is the universal recipient because it has
no antibodies against A or B antigens.
Question 11:
Which protein is essential for clot formation?
A. Albumin
B. Fibrin
C. Immunoglobulin
D. Collagen
Correct Answer: B. Fibrin
BIOL 251 Human Anatomy &
Physiology 1 Module 3 Exam
Complete Lecture-Based Review and
Assessment Practice Guide
2026/2027
Question 1:
A patient is diagnosed with anemia caused by a genetic defect that produces abnormal
hemoglobin. Which condition is most likely present?
A. Hemorrhagic anemia
B. Aplastic anemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: D. Sickle cell anemia
Rationale: Sickle cell anemia is a hereditary disorder caused by a mutation in the
hemoglobin gene, leading to abnormal, crescent-shaped red blood cells that obstruct
blood flow and reduce oxygen delivery. Hemorrhagic anemia results from blood loss,
aplastic anemia from bone marrow failure, and pernicious anemia from vitamin B12
deficiency affecting RBC production.
Question 2:
Which white blood cell is primarily responsible for defending the body against
parasitic infections?
A. Erythrocyte
B. Basophil
C. Neutrophil
D. Lymphocyte
E. Eosinophil
Correct Answer: E. Eosinophil
Rationale: Eosinophils play a major role in combating parasitic infections and are also
involved in allergic responses. Neutrophils primarily target bacteria, lymphocytes
regulate adaptive immunity, basophils release histamine in allergic reactions, and
erythrocytes transport oxygen.
,2026/2027
Question 3:
Blood clotting depends primarily on which vitamin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin K
E. Vitamin C
Correct Answer: D. Vitamin K
Rationale: Vitamin K is essential for the synthesis of clotting factors in the liver,
including prothrombin. Without it, proper coagulation cannot occur. Other vitamins
play roles in vision (A), calcium regulation (D), antioxidant protection (E), and
cellular protection (E), but not clotting.
Question 4:
Which blood cell is directly responsible for clot formation?
A. Erythrocyte
B. Basophil
C. Neutrophil
D. Thrombocyte
E. Eosinophil
Correct Answer: D. Thrombocyte
Rationale: Thrombocytes, also known as platelets, are responsible for initiating blood
clot formation by aggregating at injury sites. Red blood cells transport oxygen, while
white blood cells such as basophils, neutrophils, and eosinophils function in immunity
rather than clotting.
Question 5:
An abnormally increased number of red blood cells is known as:
A. Hemorrhagic anemia
B. Polycythemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: B. Polycythemia
Rationale: Polycythemia is characterized by excessive red blood cell production,
increasing blood viscosity and risk of thrombosis. Anemia conditions involve reduced
,2026/2027
RBCs or hemoglobin, while sickle cell anemia involves structural defects in
hemoglobin rather than increased cell numbers.
Question 6:
Destruction or failure of bone marrow leading to decreased blood cell production is
called:
A. Hemorrhagic anemia
B. Aplastic anemia
C. Pernicious anemia
D. Sickle cell anemia
Correct Answer: B. Aplastic anemia
Rationale: Aplastic anemia occurs when bone marrow fails to produce sufficient
blood cells, often due to toxins, drugs, or autoimmune damage. Other forms of anemia
involve blood loss, vitamin deficiency, or hemoglobin abnormalities rather than
marrow failure.
Question 7:
Anemia is best defined as:
A. Excess red blood cell production
B. Inability of blood to carry sufficient oxygen
C. Excess white blood cells
D. Excess clotting factors
Correct Answer: B. Inability of blood to carry sufficient oxygen
Rationale: Anemia refers to a reduced oxygen-carrying capacity of blood, usually due
to low hemoglobin or RBC count. It is not defined by increased cells or clotting
factors but by impaired oxygen delivery to tissues.
Question 8:
Rh incompatibility between mother and fetus can lead to:
A. Sickle cell anemia
B. Erythroblastosis fetalis
C. Iron deficiency anemia
D. Leukocytosis
Correct Answer: B. Erythroblastosis fetalis
, 2026/2027
Rationale: This condition occurs when an Rh-negative mother develops antibodies
against Rh-positive fetal red blood cells, leading to hemolysis. Other options represent
unrelated hematological disorders.
Question 9:
Blood without formed elements and clotting factors is called:
A. Albumin
B. Serum
C. Plasma
D. Globulin
Correct Answer: B. Serum
Rationale: Serum is plasma without clotting factors such as fibrinogen. Plasma
contains clotting proteins, while albumin and globulins are specific plasma proteins
rather than whole fluid components.
Question 10:
The universal donor blood type in the ABO system is:
A. Type A
B. Type B
C. Type AB
D. Type O
Correct Answer: D. Type O
Rationale: Type O blood lacks A and B antigens, making it compatible with all ABO
blood types for red cell transfusion. Type AB is the universal recipient because it has
no antibodies against A or B antigens.
Question 11:
Which protein is essential for clot formation?
A. Albumin
B. Fibrin
C. Immunoglobulin
D. Collagen
Correct Answer: B. Fibrin
