Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions &
Answers | 100% Correct | Grade A - Chamberlain 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027)
Anatomy and Physiology III with Lab | Questions &
Answers | 100% Correct | Grade A - Chamberlain
2026/2027
EDITION
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Cardiovascular System Blood Vessels & Circulation
Heart Anatomy & Physiology Blood Pressure & Regulation
Cardiac Cycle & Conduction
COVER PAGE - 1
, SECTION 1 | Cardiovascular System | Q1-Q15 | 2026/2027
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A -
Chamberlain 2026/2027
Q1 Question 1 of 75
A 45-year-old patient presents with fatigue and pallor. Laboratory tests reveal low hemoglobin and
hematocrit. The physician explains that the cardiovascular system transports oxygen throughout the
body using hemoglobin in red blood cells. Hemoglobin is a protein composed of four globin chains and
how many heme groups, each containing an iron atom that binds oxygen?
A. Four heme groups with four iron atoms
B. One heme group with one iron atom
C. Two heme groups with two iron atoms
D. Eight heme groups with eight iron atoms
Correct Answer: A
Rationale:
Hemoglobin consists of four globin protein chains (two alpha and two beta in adult hemoglobin A), each bound to one
heme group containing one iron atom, for a total of four heme groups and four iron atoms. Each iron atom binds one
oxygen molecule, so one hemoglobin molecule can carry four oxygen molecules.
Q2 Question 2 of 75
A 60-year-old patient with chronic kidney disease presents with anemia. The nephrologist explains that
the kidneys produce a hormone that stimulates red blood cell production in the bone marrow. This
hormone is called which of the following?
A. Renin, which regulates blood pressure
B. Erythropoietin, which stimulates red blood cell production
C. Aldosterone, which regulates sodium
D. Antidiuretic hormone, which regulates water
Correct Answer: B
Rationale:
Erythropoietin (EPO) is produced by the kidneys in response to low oxygen levels and stimulates red blood cell
production in the red bone marrow. Chronic kidney disease reduces EPO production, causing anemia. Renin regulates
blood pressure, aldosterone regulates sodium, and ADH regulates water reabsorption.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 2 of 42
, Q3 Question 3 of 75
A 35-year-old patient presents with jaundice and is diagnosed with hemolytic anemia. The physician
explains that the breakdown of red blood cells produces bilirubin, which is processed by which organ
before excretion?
A. The spleen, which stores bilirubin
B. The kidneys, which excrete bilirubin in urine
C. The liver, which conjugates bilirubin for excretion in bile
D. The lungs, which excrete bilirubin in exhaled air
Correct Answer: C
Rationale:
The liver conjugates bilirubin (a byproduct of heme breakdown from old red blood cells) and excretes it in bile. When red
blood cell breakdown exceeds the liver's capacity (as in hemolytic anemia), unconjugated bilirubin accumulates, causing
jaundice. The spleen breaks down old RBCs but does not process bilirubin.
Q4 Question 4 of 75
A 50-year-old patient on warfarin therapy has an elevated INR. The physician orders vitamin K to
reverse the anticoagulant effects. Vitamin K is essential for the production of which clotting factors?
A. Factors II, VII, IX, and X, which are produced in the liver
B. Factors I and II only
C. Factors V and VIII only
D. Factors XI and XII only
Correct Answer: A
Rationale:
Vitamin K is essential for the hepatic production of clotting factors II (prothrombin), VII, IX, and X, as well as proteins C
and S. Warfarin inhibits vitamin K-dependent clotting factor synthesis, which is why vitamin K reverses warfarin's effects.
The liver is the site of production.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 3 of 42
, Q5 Question 5 of 75
A 28-year-old patient with menorrhagia (heavy menstrual bleeding) is evaluated for a bleeding
disorder. The physician suspects von Willebrand disease, which involves a deficiency of von
Willebrand factor. What is the primary function of von Willebrand factor?
A. Activating fibrin to form a clot
B. Mediating platelet adhesion to damaged endothelium
C. Degrading clots through fibrinolysis
D. Inhibiting clotting factors
Correct Answer: B
Rationale:
Von Willebrand factor (vWF) mediates platelet adhesion to damaged endothelium by binding to platelet glycoprotein Ib
and exposed collagen, and also carries factor VIII in the blood. Deficiency causes impaired platelet plug formation and
excessive bleeding. It does not activate fibrin, degrade clots, or inhibit clotting.
Q6 Question 6 of 75
A 55-year-old patient with atherosclerosis has a blood clot in a coronary artery. The physician explains
that the clot (thrombus) formation involves platelets and a fibrin mesh. The final step in the common
pathway of coagulation, where fibrinogen is converted to fibrin, is catalyzed by which factor?
A. Factor VII
B. Factor IX
C. Factor II (thrombin)
D. Factor XII
Correct Answer: C
Rationale:
Factor II, thrombin, catalyzes the conversion of fibrinogen (Factor I) to fibrin, which forms the mesh of the clot. Thrombin
also activates factor XIII, which stabilizes the fibrin clot. Factor VII is in the extrinsic pathway, Factor IX in the intrinsic
pathway, and Factor XII initiates the intrinsic pathway.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 4 of 42
Answers | 100% Correct | Grade A - Chamberlain 2026/2027
OBJECTIVE ASSESSMENT - EXAM
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027)
Anatomy and Physiology III with Lab | Questions &
Answers | 100% Correct | Grade A - Chamberlain
2026/2027
EDITION
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Cardiovascular System Blood Vessels & Circulation
Heart Anatomy & Physiology Blood Pressure & Regulation
Cardiac Cycle & Conduction
COVER PAGE - 1
, SECTION 1 | Cardiovascular System | Q1-Q15 | 2026/2027
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A -
Chamberlain 2026/2027
Q1 Question 1 of 75
A 45-year-old patient presents with fatigue and pallor. Laboratory tests reveal low hemoglobin and
hematocrit. The physician explains that the cardiovascular system transports oxygen throughout the
body using hemoglobin in red blood cells. Hemoglobin is a protein composed of four globin chains and
how many heme groups, each containing an iron atom that binds oxygen?
A. Four heme groups with four iron atoms
B. One heme group with one iron atom
C. Two heme groups with two iron atoms
D. Eight heme groups with eight iron atoms
Correct Answer: A
Rationale:
Hemoglobin consists of four globin protein chains (two alpha and two beta in adult hemoglobin A), each bound to one
heme group containing one iron atom, for a total of four heme groups and four iron atoms. Each iron atom binds one
oxygen molecule, so one hemoglobin molecule can carry four oxygen molecules.
Q2 Question 2 of 75
A 60-year-old patient with chronic kidney disease presents with anemia. The nephrologist explains that
the kidneys produce a hormone that stimulates red blood cell production in the bone marrow. This
hormone is called which of the following?
A. Renin, which regulates blood pressure
B. Erythropoietin, which stimulates red blood cell production
C. Aldosterone, which regulates sodium
D. Antidiuretic hormone, which regulates water
Correct Answer: B
Rationale:
Erythropoietin (EPO) is produced by the kidneys in response to low oxygen levels and stimulates red blood cell
production in the red bone marrow. Chronic kidney disease reduces EPO production, causing anemia. Renin regulates
blood pressure, aldosterone regulates sodium, and ADH regulates water reabsorption.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 2 of 42
, Q3 Question 3 of 75
A 35-year-old patient presents with jaundice and is diagnosed with hemolytic anemia. The physician
explains that the breakdown of red blood cells produces bilirubin, which is processed by which organ
before excretion?
A. The spleen, which stores bilirubin
B. The kidneys, which excrete bilirubin in urine
C. The liver, which conjugates bilirubin for excretion in bile
D. The lungs, which excrete bilirubin in exhaled air
Correct Answer: C
Rationale:
The liver conjugates bilirubin (a byproduct of heme breakdown from old red blood cells) and excretes it in bile. When red
blood cell breakdown exceeds the liver's capacity (as in hemolytic anemia), unconjugated bilirubin accumulates, causing
jaundice. The spleen breaks down old RBCs but does not process bilirubin.
Q4 Question 4 of 75
A 50-year-old patient on warfarin therapy has an elevated INR. The physician orders vitamin K to
reverse the anticoagulant effects. Vitamin K is essential for the production of which clotting factors?
A. Factors II, VII, IX, and X, which are produced in the liver
B. Factors I and II only
C. Factors V and VIII only
D. Factors XI and XII only
Correct Answer: A
Rationale:
Vitamin K is essential for the hepatic production of clotting factors II (prothrombin), VII, IX, and X, as well as proteins C
and S. Warfarin inhibits vitamin K-dependent clotting factor synthesis, which is why vitamin K reverses warfarin's effects.
The liver is the site of production.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 3 of 42
, Q5 Question 5 of 75
A 28-year-old patient with menorrhagia (heavy menstrual bleeding) is evaluated for a bleeding
disorder. The physician suspects von Willebrand disease, which involves a deficiency of von
Willebrand factor. What is the primary function of von Willebrand factor?
A. Activating fibrin to form a clot
B. Mediating platelet adhesion to damaged endothelium
C. Degrading clots through fibrinolysis
D. Inhibiting clotting factors
Correct Answer: B
Rationale:
Von Willebrand factor (vWF) mediates platelet adhesion to damaged endothelium by binding to platelet glycoprotein Ib
and exposed collagen, and also carries factor VIII in the blood. Deficiency causes impaired platelet plug formation and
excessive bleeding. It does not activate fibrin, degrade clots, or inhibit clotting.
Q6 Question 6 of 75
A 55-year-old patient with atherosclerosis has a blood clot in a coronary artery. The physician explains
that the clot (thrombus) formation involves platelets and a fibrin mesh. The final step in the common
pathway of coagulation, where fibrinogen is converted to fibrin, is catalyzed by which factor?
A. Factor VII
B. Factor IX
C. Factor II (thrombin)
D. Factor XII
Correct Answer: C
Rationale:
Factor II, thrombin, catalyzes the conversion of fibrinogen (Factor I) to fibrin, which forms the mesh of the clot. Thrombin
also activates factor XIII, which stabilizes the fibrin clot. Factor VII is in the extrinsic pathway, Factor IX in the intrinsic
pathway, and Factor XII initiates the intrinsic pathway.
Exam 3: BIOS255 / BIOS 255 (Latest Update 2026/2027) Anatomy and Physiology III with Lab | Questions & Answers | 100% Correct | Grade A - Chamberlain 2026/2027 - 2026/2027 | Passing Score: 80% |
Page 4 of 42
