BIOL 252 Human Anatomy and Physiology II Post Lab #2 Heart,
Blood Vessels, And Blood Pressure Real Test Review/ BSU
BIOL 252 Lab 2 Review Test Submission 2026 2027
Exam
Section 1: Blood Composition & Hematology (Q1–20)
Q1. Which of the following makes up the largest percentage of whole blood by
volume?
A) Leukocytes
B) Erythrocytes
C) Plasma
D) Platelets
Answer: C
Rationale: Plasma accounts for ~55% of whole blood. Erythrocytes are ~45%.
Leukocytes and platelets are <1%.
Q2. The buffy coat found after centrifuging blood contains:
A) RBCs and plasma
B) Leukocytes and platelets
C) Albumin and fibrinogen
D) Only neutrophils
Answer: B
Rationale: The buffy coat is the thin white layer between plasma (top) and RBCs
(bottom); it consists of WBCs and platelets.
Q3. Which plasma protein is primarily responsible for maintaining colloid osmotic
pressure?
A) Fibrinogen
B) Globulin
,C) Albumin
D) Hemoglobin
Answer: C
Rationale: Albumin is the most abundant plasma protein and creates osmotic
pressure to keep fluid in blood vessels.
Q4. Erythropoietin (EPO) is produced mainly by the:
A) Liver
B) Spleen
C) Bone marrow
D) Kidneys
Answer: D
Rationale: The kidneys detect low O₂ and release EPO to stimulate RBC
production in bone marrow.
Q5. A biconcave disc shape increases surface area for:
A) Phagocytosis
B) Gas exchange
C) Clotting
D) Antibody production
Answer: B
Rationale: The biconcave shape allows more membrane surface for O₂ and CO₂
diffusion.
Q6. Most abundant leukocyte in a healthy adult:
A) Lymphocyte
B) Eosinophil
C) Neutrophil
D) Basophil
, Answer: C
Rationale: Neutrophils make up 50–70% of WBCs and are first responders to
bacterial infection.
Q7. Which term describes WBCs squeezing out of blood vessels?
A) Chemotaxis
B) Diapedesis
C) Phagocytosis
D) Hematopoiesis
Answer: B
Rationale: Diapedesis = emigration of WBCs through intact vessel walls into
tissues.
Q8. A high eosinophil count suggests:
A) Viral infection
B) Parasitic infection or allergy
C) Bacterial sepsis
D) Bleeding disorder
Answer: B
Rationale: Eosinophils increase in parasitic infections and allergic reactions.
Q9. Lifespan of a typical red blood cell:
A) 24 hours
B) 7 days
C) 120 days
D) 1 year
Answer: C
Rationale: RBCs lack a nucleus and last ~120 days before being recycled by the
spleen.
Blood Vessels, And Blood Pressure Real Test Review/ BSU
BIOL 252 Lab 2 Review Test Submission 2026 2027
Exam
Section 1: Blood Composition & Hematology (Q1–20)
Q1. Which of the following makes up the largest percentage of whole blood by
volume?
A) Leukocytes
B) Erythrocytes
C) Plasma
D) Platelets
Answer: C
Rationale: Plasma accounts for ~55% of whole blood. Erythrocytes are ~45%.
Leukocytes and platelets are <1%.
Q2. The buffy coat found after centrifuging blood contains:
A) RBCs and plasma
B) Leukocytes and platelets
C) Albumin and fibrinogen
D) Only neutrophils
Answer: B
Rationale: The buffy coat is the thin white layer between plasma (top) and RBCs
(bottom); it consists of WBCs and platelets.
Q3. Which plasma protein is primarily responsible for maintaining colloid osmotic
pressure?
A) Fibrinogen
B) Globulin
,C) Albumin
D) Hemoglobin
Answer: C
Rationale: Albumin is the most abundant plasma protein and creates osmotic
pressure to keep fluid in blood vessels.
Q4. Erythropoietin (EPO) is produced mainly by the:
A) Liver
B) Spleen
C) Bone marrow
D) Kidneys
Answer: D
Rationale: The kidneys detect low O₂ and release EPO to stimulate RBC
production in bone marrow.
Q5. A biconcave disc shape increases surface area for:
A) Phagocytosis
B) Gas exchange
C) Clotting
D) Antibody production
Answer: B
Rationale: The biconcave shape allows more membrane surface for O₂ and CO₂
diffusion.
Q6. Most abundant leukocyte in a healthy adult:
A) Lymphocyte
B) Eosinophil
C) Neutrophil
D) Basophil
, Answer: C
Rationale: Neutrophils make up 50–70% of WBCs and are first responders to
bacterial infection.
Q7. Which term describes WBCs squeezing out of blood vessels?
A) Chemotaxis
B) Diapedesis
C) Phagocytosis
D) Hematopoiesis
Answer: B
Rationale: Diapedesis = emigration of WBCs through intact vessel walls into
tissues.
Q8. A high eosinophil count suggests:
A) Viral infection
B) Parasitic infection or allergy
C) Bacterial sepsis
D) Bleeding disorder
Answer: B
Rationale: Eosinophils increase in parasitic infections and allergic reactions.
Q9. Lifespan of a typical red blood cell:
A) 24 hours
B) 7 days
C) 120 days
D) 1 year
Answer: C
Rationale: RBCs lack a nucleus and last ~120 days before being recycled by the
spleen.
