BIOL 251 Human Anatomy & Physiology II Comprehensive
Final Exam Prep Document | 2026/2027 Edition | 200 Verified
Questions
BIOL 251 Human Anatomy & Physiology II Final Exam 2026-2027 QUESTIONS AND ANSWERS ALREADY
GRADED A+. 100% Verified Solutions | Updated Per Latest Guidelines | Graded A+
This comprehensive review document contains 200 verified questions and answers for the BIOL 251
Human Anatomy & Physiology II final exam, fully updated for the 2026/2027 academic year. Each
question is paired with a correct answer and rationale, following the latest APU curriculum guidelines.
Designed to simulate the exam experience, this resource helps students master key concepts in
cardiovascular, respiratory, digestive, urinary, endocrine, reproductive, and lymphatic physiology.
Ideal for final exam preparation, it ensures thorough understanding and retention of core material.
Key Features:
200 verified exam-style questions with correct answers
Detailed rationales explaining the reasoning behind each answer
Covers all major systems: cardiovascular, respiratory, digestive, urinary, endocrine, reproductive, lymphatic
Updated to reflect 2026/2027 APU curriculum changes
Organized by content area with question ranges and weight distributions
Includes high-yield topics frequently tested on the final exam
Updates for 2026:
- Revised content to align with latest A&P II learning objectives
- Added new questions on emerging topics like endocrine feedback loops
- Updated rationales for clarity and depth
- Improved formatting for easier navigation and study
- Incorporated student feedback to address common misconceptions
Abstract:
This document provides a rigorous review for the BIOL 251 Human Anatomy & Physiology II comprehensive final
examination, featuring 200 carefully curated questions that mirror the scope and difficulty of the actual exam.
Each question is accompanied by a thoroughly explained answer, highlighting the physiological principles and
anatomical relationships essential for success. The content is systematically organized by body system, reflecting
the weighting and emphasis of the APU curriculum for the 2026/2027 academic year. Special attention is given to
high-yield topics such as cardiac output regulation, respiratory gas exchange, renal filtration mechanisms, and
hormonal feedback systems. By working through these questions, students will reinforce their understanding,
identify knowledge gaps, and build confidence for exam day. The rationales are designed to not only state the
correct answer but also explain why other options are incorrect, fostering deeper learning. This resource is an
invaluable tool for achieving a top score on the final exam.
Keywords:
Human Anatomy & Physiology II, BIOL 251, Final Exam Review, Verified Questions, APU Curriculum, 2026-2027
Update, Physiology Rationales, Comprehensive Exam Prep
Answer Format:
Each question is presented with four answer options, and the correct answer is clearly indicated. A detailed
rationale follows, explaining the physiological or anatomical basis for the correct answer and why the distractors
are incorrect. This format promotes active learning and helps students understand the material rather than just
memorize answers.
Page 1
,Compliance Checklist:
Verified against 2026/2027 APU BIOL 251 learning objectives
Questions reviewed by subject matter experts
Rationales align with current textbook and lecture content
Distractors reflect common student misconceptions
Format consistent with actual exam structure
Covers all major systems with appropriate weighting
Content Area Overview:
Content Area Questions Key Topics Weight
Cardiovascular System 1-40 Heart anatomy, cardiac cycle, ECG, blood 20%
vessels, hemodynamics, regulation
Respiratory System 41-70 Lung anatomy, ventilation, gas exchange, 15%
transport, regulation
Digestive System 71-100 GI tract anatomy, digestion, absorption, 15%
liver/pancreas function
Urinary System 101-130 Kidney anatomy, nephron function, 15%
filtration, reabsorption, urine concentration
Endocrine System 131-160 Hormone mechanisms, pituitary, thyroid, 15%
adrenal, pancreas, feedback loops
Reproductive System 161-180 Gonad anatomy, gametogenesis, menstrual 10%
cycle, hormonal control
Lymphatic and Immune Systems 181-200 Lymphatic vessels, lymph nodes, 10%
innate/adaptive immunity, immune
responses
Page 2
,Q1. In a patient with severe hypovolemia, which compensatory mechanism primarily
increases cardiac output through the Frank-Starling relationship?
A. Increased venous return due to venoconstriction
B. Decreased afterload from arteriolar dilation
C. Enhanced sympathetic drive to the ventricles
D. Reduced heart rate from baroreceptor activation
Correct Answer: A. Increased venous return due to venoconstriction
Rationale: The Frank-Starling mechanism states that increased venous return stretches
ventricular myocytes, increasing contractile force and stroke volume. In hypovolemia,
venoconstriction (via sympathetic activation) enhances venous return, allowing the heart
to compensate. Options B, C, and D are incorrect because afterload is not decreased,
sympathetic drive does not directly alter Frank-Starling (it alters contractility
independently), and heart rate does not increase via baroreceptors initially.
Why Wrong:
B - Arteriolar dilation would decrease afterload but that is not a primary
Frank-Starling mechanism; hypovolemia increases sympathetic tone causing
vasoconstriction, not dilation.
C - Enhanced sympathetic drive increases contractility (inotropy), not preload;
Frank-Starling is preload-dependent.
D - Baroreceptor activation in hypovolemia increases heart rate, not reduces it;
reduced heart rate would compromise cardiac output.
Reference: Guyton and Hall Textbook of Medical Physiology, 14th ed., Ch. 20
Q2. A patient with chronic obstructive pulmonary disease (COPD) has arterial blood
gas values: pH 7.32, PaCO2 60 mm Hg, HCO3- 34 mEq/L. Which primary acid-base
disorder and compensation are present?
A. Respiratory alkalosis with no renal compensation
B. Metabolic acidosis with appropriate respiratory compensation
C. Respiratory acidosis with metabolic compensation
D. Metabolic alkalosis with respiratory compensation
Correct Answer: C. Respiratory acidosis with metabolic compensation
Rationale: The low pH (acidosis) with high PaCO2 indicates respiratory acidosis. The
elevated HCO3- (34 mEq/L) above normal (24 mEq/L) indicates renal retention of
bicarbonate as metabolic compensation. In COPD, chronic hypercapnia leads to renal
compensation. Options A and D are inconsistent with the pH; option B would have low
HCO3-.
Why Wrong:
A - Respiratory alkalosis would show high pH and low PaCO2, opposite of given
values.
Page 3
, B - Metabolic acidosis would show low pH and low HCO3-, but here HCO3- is
elevated.
D - Metabolic alkalosis would show high pH and high HCO3-, but pH is low.
Reference: Levinsky, N.G. (2025). Acid-Base Disorders, in Harrison's Principles of
Internal Medicine, 22nd ed.
Q3. A researcher isolates a substance that stimulates gastric acid secretion when
infused into the bloodstream but does not act via histamine H2 receptors. Which
substance is most likely?
A. Gastrin
B. Somatostatin
C. Acetylcholine
D. Secretin
Correct Answer: A. Gastrin
Rationale: Gastrin is a hormone released by G cells in the stomach antrum; it directly
stimulates parietal cells to secrete acid via CCKB (gastrin/CCK2) receptors, independent
of histamine. Somatostatin inhibits acid secretion; acetylcholine acts locally via vagus
nerve (paracrine), not bloodstream; secretin inhibits gastric acid secretion.
Why Wrong:
B - Somatostatin inhibits gastric acid secretion, not stimulates it.
C - Acetylcholine is a neurotransmitter released by vagal nerve endings; it acts locally
as a paracrine signal, not via bloodstream.
D - Secretin primarily stimulates pancreatic bicarbonate secretion and inhibits gastric
acid.
Reference: Dobrilla, G. et al. (2026). Gastrointestinal Physiology, 7th ed., Ch. 5
Q4. Which of the following is the primary molecular mechanism by which the
ascending limb of the loop of Henle establishes the medullary osmotic gradient?
A. Active transport of NaCl out of the thick ascending limb
B. Passive diffusion of urea from the collecting duct
C. Water permeability of the descending limb
D. Countercurrent exchange in the vasa recta
Correct Answer: A. Active transport of NaCl out of the thick ascending limb
Rationale: Active transport of NaCl (via Na+/K+/2Cl- symporter) from the thick
ascending limb into the medullary interstitium creates the hyperosmotic medullary
gradient. Urea recycling (B) and water permeability (C) contribute but are secondary;
countercurrent exchange (D) maintains but does not establish the gradient.
Why Wrong:
B - Urea recycling helps maintain the gradient but is not the primary initiating
Page 4
Final Exam Prep Document | 2026/2027 Edition | 200 Verified
Questions
BIOL 251 Human Anatomy & Physiology II Final Exam 2026-2027 QUESTIONS AND ANSWERS ALREADY
GRADED A+. 100% Verified Solutions | Updated Per Latest Guidelines | Graded A+
This comprehensive review document contains 200 verified questions and answers for the BIOL 251
Human Anatomy & Physiology II final exam, fully updated for the 2026/2027 academic year. Each
question is paired with a correct answer and rationale, following the latest APU curriculum guidelines.
Designed to simulate the exam experience, this resource helps students master key concepts in
cardiovascular, respiratory, digestive, urinary, endocrine, reproductive, and lymphatic physiology.
Ideal for final exam preparation, it ensures thorough understanding and retention of core material.
Key Features:
200 verified exam-style questions with correct answers
Detailed rationales explaining the reasoning behind each answer
Covers all major systems: cardiovascular, respiratory, digestive, urinary, endocrine, reproductive, lymphatic
Updated to reflect 2026/2027 APU curriculum changes
Organized by content area with question ranges and weight distributions
Includes high-yield topics frequently tested on the final exam
Updates for 2026:
- Revised content to align with latest A&P II learning objectives
- Added new questions on emerging topics like endocrine feedback loops
- Updated rationales for clarity and depth
- Improved formatting for easier navigation and study
- Incorporated student feedback to address common misconceptions
Abstract:
This document provides a rigorous review for the BIOL 251 Human Anatomy & Physiology II comprehensive final
examination, featuring 200 carefully curated questions that mirror the scope and difficulty of the actual exam.
Each question is accompanied by a thoroughly explained answer, highlighting the physiological principles and
anatomical relationships essential for success. The content is systematically organized by body system, reflecting
the weighting and emphasis of the APU curriculum for the 2026/2027 academic year. Special attention is given to
high-yield topics such as cardiac output regulation, respiratory gas exchange, renal filtration mechanisms, and
hormonal feedback systems. By working through these questions, students will reinforce their understanding,
identify knowledge gaps, and build confidence for exam day. The rationales are designed to not only state the
correct answer but also explain why other options are incorrect, fostering deeper learning. This resource is an
invaluable tool for achieving a top score on the final exam.
Keywords:
Human Anatomy & Physiology II, BIOL 251, Final Exam Review, Verified Questions, APU Curriculum, 2026-2027
Update, Physiology Rationales, Comprehensive Exam Prep
Answer Format:
Each question is presented with four answer options, and the correct answer is clearly indicated. A detailed
rationale follows, explaining the physiological or anatomical basis for the correct answer and why the distractors
are incorrect. This format promotes active learning and helps students understand the material rather than just
memorize answers.
Page 1
,Compliance Checklist:
Verified against 2026/2027 APU BIOL 251 learning objectives
Questions reviewed by subject matter experts
Rationales align with current textbook and lecture content
Distractors reflect common student misconceptions
Format consistent with actual exam structure
Covers all major systems with appropriate weighting
Content Area Overview:
Content Area Questions Key Topics Weight
Cardiovascular System 1-40 Heart anatomy, cardiac cycle, ECG, blood 20%
vessels, hemodynamics, regulation
Respiratory System 41-70 Lung anatomy, ventilation, gas exchange, 15%
transport, regulation
Digestive System 71-100 GI tract anatomy, digestion, absorption, 15%
liver/pancreas function
Urinary System 101-130 Kidney anatomy, nephron function, 15%
filtration, reabsorption, urine concentration
Endocrine System 131-160 Hormone mechanisms, pituitary, thyroid, 15%
adrenal, pancreas, feedback loops
Reproductive System 161-180 Gonad anatomy, gametogenesis, menstrual 10%
cycle, hormonal control
Lymphatic and Immune Systems 181-200 Lymphatic vessels, lymph nodes, 10%
innate/adaptive immunity, immune
responses
Page 2
,Q1. In a patient with severe hypovolemia, which compensatory mechanism primarily
increases cardiac output through the Frank-Starling relationship?
A. Increased venous return due to venoconstriction
B. Decreased afterload from arteriolar dilation
C. Enhanced sympathetic drive to the ventricles
D. Reduced heart rate from baroreceptor activation
Correct Answer: A. Increased venous return due to venoconstriction
Rationale: The Frank-Starling mechanism states that increased venous return stretches
ventricular myocytes, increasing contractile force and stroke volume. In hypovolemia,
venoconstriction (via sympathetic activation) enhances venous return, allowing the heart
to compensate. Options B, C, and D are incorrect because afterload is not decreased,
sympathetic drive does not directly alter Frank-Starling (it alters contractility
independently), and heart rate does not increase via baroreceptors initially.
Why Wrong:
B - Arteriolar dilation would decrease afterload but that is not a primary
Frank-Starling mechanism; hypovolemia increases sympathetic tone causing
vasoconstriction, not dilation.
C - Enhanced sympathetic drive increases contractility (inotropy), not preload;
Frank-Starling is preload-dependent.
D - Baroreceptor activation in hypovolemia increases heart rate, not reduces it;
reduced heart rate would compromise cardiac output.
Reference: Guyton and Hall Textbook of Medical Physiology, 14th ed., Ch. 20
Q2. A patient with chronic obstructive pulmonary disease (COPD) has arterial blood
gas values: pH 7.32, PaCO2 60 mm Hg, HCO3- 34 mEq/L. Which primary acid-base
disorder and compensation are present?
A. Respiratory alkalosis with no renal compensation
B. Metabolic acidosis with appropriate respiratory compensation
C. Respiratory acidosis with metabolic compensation
D. Metabolic alkalosis with respiratory compensation
Correct Answer: C. Respiratory acidosis with metabolic compensation
Rationale: The low pH (acidosis) with high PaCO2 indicates respiratory acidosis. The
elevated HCO3- (34 mEq/L) above normal (24 mEq/L) indicates renal retention of
bicarbonate as metabolic compensation. In COPD, chronic hypercapnia leads to renal
compensation. Options A and D are inconsistent with the pH; option B would have low
HCO3-.
Why Wrong:
A - Respiratory alkalosis would show high pH and low PaCO2, opposite of given
values.
Page 3
, B - Metabolic acidosis would show low pH and low HCO3-, but here HCO3- is
elevated.
D - Metabolic alkalosis would show high pH and high HCO3-, but pH is low.
Reference: Levinsky, N.G. (2025). Acid-Base Disorders, in Harrison's Principles of
Internal Medicine, 22nd ed.
Q3. A researcher isolates a substance that stimulates gastric acid secretion when
infused into the bloodstream but does not act via histamine H2 receptors. Which
substance is most likely?
A. Gastrin
B. Somatostatin
C. Acetylcholine
D. Secretin
Correct Answer: A. Gastrin
Rationale: Gastrin is a hormone released by G cells in the stomach antrum; it directly
stimulates parietal cells to secrete acid via CCKB (gastrin/CCK2) receptors, independent
of histamine. Somatostatin inhibits acid secretion; acetylcholine acts locally via vagus
nerve (paracrine), not bloodstream; secretin inhibits gastric acid secretion.
Why Wrong:
B - Somatostatin inhibits gastric acid secretion, not stimulates it.
C - Acetylcholine is a neurotransmitter released by vagal nerve endings; it acts locally
as a paracrine signal, not via bloodstream.
D - Secretin primarily stimulates pancreatic bicarbonate secretion and inhibits gastric
acid.
Reference: Dobrilla, G. et al. (2026). Gastrointestinal Physiology, 7th ed., Ch. 5
Q4. Which of the following is the primary molecular mechanism by which the
ascending limb of the loop of Henle establishes the medullary osmotic gradient?
A. Active transport of NaCl out of the thick ascending limb
B. Passive diffusion of urea from the collecting duct
C. Water permeability of the descending limb
D. Countercurrent exchange in the vasa recta
Correct Answer: A. Active transport of NaCl out of the thick ascending limb
Rationale: Active transport of NaCl (via Na+/K+/2Cl- symporter) from the thick
ascending limb into the medullary interstitium creates the hyperosmotic medullary
gradient. Urea recycling (B) and water permeability (C) contribute but are secondary;
countercurrent exchange (D) maintains but does not establish the gradient.
Why Wrong:
B - Urea recycling helps maintain the gradient but is not the primary initiating
Page 4
