MARIEB HUMAN ANATOMY & PHYSIOLOGY
12TH EDITION
AUTHOR(S)KATJA HOEHN; LAWRENCE W. HAYNES; MATTHEW
A. ABBOTT
PRACTICE QUESTIONS AND DETAILED RATIONALES
The Human Body: An Orientation
QUESTION 1
Reference: Chapter 1 — Complementarity of Structure and Function
A 22-year-old male presents with a rare genetic condition affecting the production of type I
collagen, a protein essential for tensile strength in connective tissues. His physical examination
reveals hypermobile joints, skin hyperextensibility, and fragile blood vessels. Based on the
principle of complementarity of structure and function, which of the following physiological
consequences would most directly result from this structural defect?
A. Decreased enzymatic activity in metabolic pathways due to abnormal protein folding
B. Reduced ability of tissues to withstand mechanical stress, leading to tissue fragility
C. Impaired nerve impulse transmission due to disrupted myelin sheath formation
D. Decreased oxygen-carrying capacity of blood due to abnormal hemoglobin structure
Correct Answer: B
,A. Incorrect: While collagen is a protein, the question addresses structural connective tissue
function, not enzymatic metabolism or protein folding abnormalities.
B. Correct: Type I collagen provides tensile strength to connective tissues. The structural defect
directly compromises the mechanical function of these tissues, resulting in the clinical
manifestations observed.
C. Incorrect: Myelin sheath formation involves lipids and specific proteins (e.g., myelin basic
protein), not type I collagen, which is primarily a structural protein of connective tissues.
D. Incorrect: Hemoglobin is a globular protein found in erythrocytes; type I collagen is a fibrous
structural protein of the extracellular matrix and does not affect oxygen transport.
Teaching Point: Structure determines function; collagen's fibrous structure provides tensile
strength, and its defect directly impairs tissue mechanical integrity.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Complementarity of Structure and Function.
QUESTION 2
Reference: Chapter 1 — Levels of Structural Organization
A student examining a microscope slide observes a structure composed of multiple layers of
tightly packed cells with minimal extracellular matrix, forming a protective barrier. The cells
exhibit distinct polarity with an apical surface exposed to the external environment and a basal
surface attached to a basement membrane. At which level of structural organization is this
structure best classified?
A. Cellular level
B. Tissue level
C. Organ level
D. Organ system level
,Correct Answer: B
A. Incorrect: The cellular level refers to individual cells; this structure consists of multiple cells
organized together in a specific arrangement.
B. Correct: The description indicates epithelial tissue, which is composed of groups of similar
cells working together to perform a common function, characterizing the tissue level of
structural organization.
C. Incorrect: An organ consists of two or more tissue types working together; this structure
contains only epithelial tissue, not multiple tissue types.
D. Incorrect: The organ system level involves multiple organs working together; this structure is
far simpler in complexity.
Teaching Point: Tissues are groups of similar cells with a common function; epithelial tissue
forms protective barriers and exhibits cellular polarity.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Levels of Structural Organization.
QUESTION 3
Reference: Chapter 1 — Necessary Life Functions — Maintaining Boundaries
A patient with extensive full-thickness burns over 40% of their body surface area is at significant
risk for infection and fluid loss. Which necessary life function is most immediately compromised
by the destruction of the cutaneous membrane?
A. Digestion
B. Metabolism
C. Maintaining boundaries
D. Excretion
Correct Answer: C
, A. Incorrect: Digestion involves the breakdown of food and occurs primarily in the digestive
tract; it is not directly affected by skin loss.
B. Incorrect: Metabolism refers to all chemical reactions in the body; while burns affect
metabolic rate, the most immediate functional compromise is barrier integrity.
C. Correct: The skin serves as the external boundary separating the internal environment from
the external environment. Destruction of this barrier compromises the body's ability to
maintain boundaries, allowing pathogen entry and fluid loss.
D. Incorrect: Excretion is the elimination of metabolic wastes; while skin does participate in
minor excretion, the primary function compromised is boundary maintenance.
Teaching Point: Maintaining boundaries through the skin and mucous membranes is essential
for protection against infection and prevention of fluid loss.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Necessary Life Functions.
QUESTION 4
Reference: Chapter 1 — Necessary Life Functions — Metabolism
A 45-year-old sedentary male begins a vigorous exercise program. Over several weeks, his
resting metabolic rate gradually increases and his skeletal muscle mass increases. These
adaptations represent which two necessary life functions occurring simultaneously?
A. Digestion and excretion
B. Metabolism and growth
C. Responsiveness and reproduction
D. Movement and maintaining boundaries
Correct Answer: B
12TH EDITION
AUTHOR(S)KATJA HOEHN; LAWRENCE W. HAYNES; MATTHEW
A. ABBOTT
PRACTICE QUESTIONS AND DETAILED RATIONALES
The Human Body: An Orientation
QUESTION 1
Reference: Chapter 1 — Complementarity of Structure and Function
A 22-year-old male presents with a rare genetic condition affecting the production of type I
collagen, a protein essential for tensile strength in connective tissues. His physical examination
reveals hypermobile joints, skin hyperextensibility, and fragile blood vessels. Based on the
principle of complementarity of structure and function, which of the following physiological
consequences would most directly result from this structural defect?
A. Decreased enzymatic activity in metabolic pathways due to abnormal protein folding
B. Reduced ability of tissues to withstand mechanical stress, leading to tissue fragility
C. Impaired nerve impulse transmission due to disrupted myelin sheath formation
D. Decreased oxygen-carrying capacity of blood due to abnormal hemoglobin structure
Correct Answer: B
,A. Incorrect: While collagen is a protein, the question addresses structural connective tissue
function, not enzymatic metabolism or protein folding abnormalities.
B. Correct: Type I collagen provides tensile strength to connective tissues. The structural defect
directly compromises the mechanical function of these tissues, resulting in the clinical
manifestations observed.
C. Incorrect: Myelin sheath formation involves lipids and specific proteins (e.g., myelin basic
protein), not type I collagen, which is primarily a structural protein of connective tissues.
D. Incorrect: Hemoglobin is a globular protein found in erythrocytes; type I collagen is a fibrous
structural protein of the extracellular matrix and does not affect oxygen transport.
Teaching Point: Structure determines function; collagen's fibrous structure provides tensile
strength, and its defect directly impairs tissue mechanical integrity.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Complementarity of Structure and Function.
QUESTION 2
Reference: Chapter 1 — Levels of Structural Organization
A student examining a microscope slide observes a structure composed of multiple layers of
tightly packed cells with minimal extracellular matrix, forming a protective barrier. The cells
exhibit distinct polarity with an apical surface exposed to the external environment and a basal
surface attached to a basement membrane. At which level of structural organization is this
structure best classified?
A. Cellular level
B. Tissue level
C. Organ level
D. Organ system level
,Correct Answer: B
A. Incorrect: The cellular level refers to individual cells; this structure consists of multiple cells
organized together in a specific arrangement.
B. Correct: The description indicates epithelial tissue, which is composed of groups of similar
cells working together to perform a common function, characterizing the tissue level of
structural organization.
C. Incorrect: An organ consists of two or more tissue types working together; this structure
contains only epithelial tissue, not multiple tissue types.
D. Incorrect: The organ system level involves multiple organs working together; this structure is
far simpler in complexity.
Teaching Point: Tissues are groups of similar cells with a common function; epithelial tissue
forms protective barriers and exhibits cellular polarity.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Levels of Structural Organization.
QUESTION 3
Reference: Chapter 1 — Necessary Life Functions — Maintaining Boundaries
A patient with extensive full-thickness burns over 40% of their body surface area is at significant
risk for infection and fluid loss. Which necessary life function is most immediately compromised
by the destruction of the cutaneous membrane?
A. Digestion
B. Metabolism
C. Maintaining boundaries
D. Excretion
Correct Answer: C
, A. Incorrect: Digestion involves the breakdown of food and occurs primarily in the digestive
tract; it is not directly affected by skin loss.
B. Incorrect: Metabolism refers to all chemical reactions in the body; while burns affect
metabolic rate, the most immediate functional compromise is barrier integrity.
C. Correct: The skin serves as the external boundary separating the internal environment from
the external environment. Destruction of this barrier compromises the body's ability to
maintain boundaries, allowing pathogen entry and fluid loss.
D. Incorrect: Excretion is the elimination of metabolic wastes; while skin does participate in
minor excretion, the primary function compromised is boundary maintenance.
Teaching Point: Maintaining boundaries through the skin and mucous membranes is essential
for protection against infection and prevention of fluid loss.
Hoehn, K., Haynes, L. W., & Abbott, M. A. Marieb Human Anatomy & Physiology (12th ed.).
Chapter 1 — Necessary Life Functions.
QUESTION 4
Reference: Chapter 1 — Necessary Life Functions — Metabolism
A 45-year-old sedentary male begins a vigorous exercise program. Over several weeks, his
resting metabolic rate gradually increases and his skeletal muscle mass increases. These
adaptations represent which two necessary life functions occurring simultaneously?
A. Digestion and excretion
B. Metabolism and growth
C. Responsiveness and reproduction
D. Movement and maintaining boundaries
Correct Answer: B
