PORTAGE LEARNING BIOL 252 MODULE 1
EXAM REVIEW BLOOD & HEMATOLOGY
QUESTIONS AND ANSWERS SUMMARY
This comprehensive exam review pack features high-yield, multiple-
choice questions with detailed rationales explicitly tailored for
Portage Learning BIOL 252 Module 1. It provides targeted coverage
on blood physiology, hematology values, plasma proteins,
hemostasis pathways, and critical laboratory safety protocols.
Designed to bypass Respondus LockDown Browser constraints, this
resource ensures complete mastery of essential human anatomy and
physiology concepts to guarantee a top-tier grade.
Which stem cell gives rise to all formed elements of the blood?
A) Lymphoid stem cell
B) Myeloid stem cell
C) Hemocytoblast
D) Megakaryocyte
Answer: C) Hemocytoblast
Rationale: The hemocytoblast is the multipotent hematopoietic stem
cell residing in the red bone marrow that differentiates into all types
of blood cells, including erythrocytes, leukocytes, and platelets.
What is the average lifespan of a mature erythrocyte in the human body?
A) 30 days
B) 60 days
C) 90 days
D) 120 days
Answer: D) 120 days
,Rationale: Due to the lack of a nucleus and organelles, mature red
blood cells cannot repair themselves or synthesize new proteins.
They break down after approximately 120 days of circulation.
Which organ is primarily responsible for trapping and destroying old, worn-
out red blood cells?
A) Liver
B) Spleen
C) Kidney
D) Red bone marrow
Answer: B) Spleen
Rationale: The spleen is often called the "red blood cell graveyard"
because its narrow capillaries trap old, fragile erythrocytes, where
splenic macrophages phagocytize them.
Which part of the hemoglobin molecule directly binds to oxygen?
A) Globin chain
B) Iron ion in the heme group
C) Biliverdin
D) Transferrin
Answer: B) Iron ion in the heme group
Rationale: Each hemoglobin molecule contains four heme groups,
and at the center of each heme group is an iron atom (\(Fe^{2+}\)) that
reversibly binds to one molecule of oxygen (\(O_{2}\)).
What is the most abundant plasma protein, and what is its primary
function?
A) Fibrinogen; blood clotting
B) Gamma globulin; immunity
C) Albumin; maintaining osmotic pressure
D) Alpha globulin; lipid transport
Answer: C) Albumin; maintaining osmotic pressure
Rationale: Albumin makes up about 60% of plasma proteins. It is
produced by the liver and acts as the primary contributor to blood
colloid osmotic pressure, preventing water from leaking into tissues.
,A patient presents with a hematocrit of 62%. Which of the following
conditions is most likely responsible?
A) Severe iron-deficiency anemia
B) Overhydration
C) Polycythemia
D) Acute hemorrhage
Answer: C) Polycythemia
Rationale: Polycythemia is an abnormal excess of erythrocytes that
raises blood viscosity and elevates hematocrit levels well above the
normal range (typically 42%–52% for males, 37%–47% for females).
During the breakdown of hemoglobin, what is the iron-free organic
component of heme initially converted into?
A) Bilirubin
B) Biliverdin
C) Stercobilin
D) Urobilin
Answer: B) Biliverdin
Rationale: When heme is dismantled, the iron is removed and stored,
while the remaining pigment ring is converted into a green pigment
called biliverdin, which is then quickly reduced to yellow bilirubin.
Where is excess iron stored in the body after erythrocytes are recycled?
A) Spleen and skeletal muscle
B) Liver and spleen
C) Kidney and red bone marrow
D) Yellow bone marrow and pancreas
Answer: B) Liver and spleen
Rationale: Iron released from hemoglobin is toxic if free, so it is safely
bound to protein complexes like ferritin and hemosiderin and stored
mainly in the liver and the spleen.
Which protein transports iron through the bloodstream to the red bone
marrow?
A) Ferritin
B) Hemosiderin
, C) Transferrin
D) Albumin
Answer: C) Transferrin
Rationale: Transferrin is a plasma glyco-protein that binds to iron
ions and safely transports them through the blood circulation to
tissues like the bone marrow for erythropoiesis.
Which hormone directly stimulates the red bone marrow to increase
erythrocyte production?
A) Thrombopoietin
B) Erythropoietin
C) Leukopoietin
D) Colony-stimulating factor
Answer: B) Erythropoietin
Rationale: Erythropoietin (EPO) is produced and released primarily by
the kidneys in response to hypoxia (low oxygen levels), targeting the
bone marrow to accelerate red blood cell production.
What physiological term describes the formal process that stops bleeding
following a vascular injury?
A) Homeostasis
B) Hemostasis
C) Hematopoiesis
D) Hemolysis
Answer: B) Hemostasis
Rationale: Hemostasis is a localized, fast, and tightly controlled
sequence of steps (vascular spasm, platelet plug formation, and
coagulation) designed to halt blood loss from a damaged vessel.
Which vitamin is completely necessary for the liver to synthesize several
crucial clotting factors, such as prothrombin?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin K
Answer: D) Vitamin K
EXAM REVIEW BLOOD & HEMATOLOGY
QUESTIONS AND ANSWERS SUMMARY
This comprehensive exam review pack features high-yield, multiple-
choice questions with detailed rationales explicitly tailored for
Portage Learning BIOL 252 Module 1. It provides targeted coverage
on blood physiology, hematology values, plasma proteins,
hemostasis pathways, and critical laboratory safety protocols.
Designed to bypass Respondus LockDown Browser constraints, this
resource ensures complete mastery of essential human anatomy and
physiology concepts to guarantee a top-tier grade.
Which stem cell gives rise to all formed elements of the blood?
A) Lymphoid stem cell
B) Myeloid stem cell
C) Hemocytoblast
D) Megakaryocyte
Answer: C) Hemocytoblast
Rationale: The hemocytoblast is the multipotent hematopoietic stem
cell residing in the red bone marrow that differentiates into all types
of blood cells, including erythrocytes, leukocytes, and platelets.
What is the average lifespan of a mature erythrocyte in the human body?
A) 30 days
B) 60 days
C) 90 days
D) 120 days
Answer: D) 120 days
,Rationale: Due to the lack of a nucleus and organelles, mature red
blood cells cannot repair themselves or synthesize new proteins.
They break down after approximately 120 days of circulation.
Which organ is primarily responsible for trapping and destroying old, worn-
out red blood cells?
A) Liver
B) Spleen
C) Kidney
D) Red bone marrow
Answer: B) Spleen
Rationale: The spleen is often called the "red blood cell graveyard"
because its narrow capillaries trap old, fragile erythrocytes, where
splenic macrophages phagocytize them.
Which part of the hemoglobin molecule directly binds to oxygen?
A) Globin chain
B) Iron ion in the heme group
C) Biliverdin
D) Transferrin
Answer: B) Iron ion in the heme group
Rationale: Each hemoglobin molecule contains four heme groups,
and at the center of each heme group is an iron atom (\(Fe^{2+}\)) that
reversibly binds to one molecule of oxygen (\(O_{2}\)).
What is the most abundant plasma protein, and what is its primary
function?
A) Fibrinogen; blood clotting
B) Gamma globulin; immunity
C) Albumin; maintaining osmotic pressure
D) Alpha globulin; lipid transport
Answer: C) Albumin; maintaining osmotic pressure
Rationale: Albumin makes up about 60% of plasma proteins. It is
produced by the liver and acts as the primary contributor to blood
colloid osmotic pressure, preventing water from leaking into tissues.
,A patient presents with a hematocrit of 62%. Which of the following
conditions is most likely responsible?
A) Severe iron-deficiency anemia
B) Overhydration
C) Polycythemia
D) Acute hemorrhage
Answer: C) Polycythemia
Rationale: Polycythemia is an abnormal excess of erythrocytes that
raises blood viscosity and elevates hematocrit levels well above the
normal range (typically 42%–52% for males, 37%–47% for females).
During the breakdown of hemoglobin, what is the iron-free organic
component of heme initially converted into?
A) Bilirubin
B) Biliverdin
C) Stercobilin
D) Urobilin
Answer: B) Biliverdin
Rationale: When heme is dismantled, the iron is removed and stored,
while the remaining pigment ring is converted into a green pigment
called biliverdin, which is then quickly reduced to yellow bilirubin.
Where is excess iron stored in the body after erythrocytes are recycled?
A) Spleen and skeletal muscle
B) Liver and spleen
C) Kidney and red bone marrow
D) Yellow bone marrow and pancreas
Answer: B) Liver and spleen
Rationale: Iron released from hemoglobin is toxic if free, so it is safely
bound to protein complexes like ferritin and hemosiderin and stored
mainly in the liver and the spleen.
Which protein transports iron through the bloodstream to the red bone
marrow?
A) Ferritin
B) Hemosiderin
, C) Transferrin
D) Albumin
Answer: C) Transferrin
Rationale: Transferrin is a plasma glyco-protein that binds to iron
ions and safely transports them through the blood circulation to
tissues like the bone marrow for erythropoiesis.
Which hormone directly stimulates the red bone marrow to increase
erythrocyte production?
A) Thrombopoietin
B) Erythropoietin
C) Leukopoietin
D) Colony-stimulating factor
Answer: B) Erythropoietin
Rationale: Erythropoietin (EPO) is produced and released primarily by
the kidneys in response to hypoxia (low oxygen levels), targeting the
bone marrow to accelerate red blood cell production.
What physiological term describes the formal process that stops bleeding
following a vascular injury?
A) Homeostasis
B) Hemostasis
C) Hematopoiesis
D) Hemolysis
Answer: B) Hemostasis
Rationale: Hemostasis is a localized, fast, and tightly controlled
sequence of steps (vascular spasm, platelet plug formation, and
coagulation) designed to halt blood loss from a damaged vessel.
Which vitamin is completely necessary for the liver to synthesize several
crucial clotting factors, such as prothrombin?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin K
Answer: D) Vitamin K
