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BIOS 242 COMPREHENSIVE EXAM 3 – 2026
CHAMBERLAIN UNIVERSITY COMPLETE (125)
CURRENT TESTING QUESTIONS AND
CORRECT ANSWERS WITH DETAILED
RATIONALES.
BIOS
Prepare for the BIOS 242 Comprehensive Exam 3 (Chamberlain University)
with focused review materials covering advanced anatomy and
physiology concepts, including the endocrine, cardiovascular, lymphatic
and immune, respiratory, digestive, urinary, and reproductive systems,
along with fluid and electrolyte balance, acid-base regulation,
homeostasis, and the integration of body systems. Designed to build
confidence in understanding complex physiological processes,
interpreting system interactions, and applying foundational science to
nursing and allied health practice. Suitable for nursing students, allied
health students, and candidates preparing for the Chamberlain University
BIOS 242 Comprehensive Exam 3.
Multiple choice.
SECTION 1: THE THREE LINES OF DEFENSE (Questions 1–20)
1. The first line of defense is composed of physical and chemical
barriers that prevent microbes from penetrating sterile body
compartments. Which of the following is considered
a physical barrier of the first line of defense?
A. Lysozyme in tears
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B. Skin and mucous membranes
C. Gastric acid
D. Antimicrobial peptides
Correct answer: B. Skin and mucous membranes
Rationale: The first line of defense consists of physical and
chemical barriers. Physical barriers include the skin (intact
epidermis) and mucous membranes, which provide a
mechanical barrier to microbial entry. Lysozyme, gastric acid,
and antimicrobial peptides are chemical barriers.
2. Which of the following is a chemical barrier of the first line of
defense?
A. The stratum corneum of the epidermis
B. Cilia in the respiratory tract
C. Lysozyme in tears and saliva
D. The flushing action of urine
Correct answer: C. Lysozyme in tears and saliva
Rationale: Chemical barriers include antimicrobial substances
such as lysozyme (an enzyme that breaks down bacterial cell
walls in tears and saliva), gastric acid, and antimicrobial
peptides. The stratum corneum and cilia are physical barriers.
3. The second line of defense is part of which type of immunity?
A. Adaptive immunity
B. Innate (nonspecific) immunity
C. Passive immunity
D. Humoral immunity
Correct answer: B. Innate (nonspecific) immunity
Rationale: The second line of defense is part of innate
(nonspecific) immunity, which includes internal defenses such
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as phagocytes, inflammation, fever, and antimicrobial proteins.
It does not require prior exposure to a pathogen.
4. The third line of defense is characterized by:
A. Nonspecific responses to any pathogen
B. Specific responses to particular pathogens with memory
C. Physical barriers such as skin
D. Chemical barriers such as gastric acid
Correct answer: B. Specific responses to particular pathogens
with memory
Rationale: The third line of defense is adaptive (specific)
immunity, which involves lymphocytes (B cells and T cells) that
produce specific responses to particular pathogens and retain
immunological memory for faster response upon re-exposure.
5. A patient has a cut on their finger that becomes infected. The
redness, heat, swelling, and pain at the infection site are signs of:
A. Adaptive immunity
B. Inflammation
C. Anaphylaxis
D. Immunological memory
Correct answer: B. Inflammation
Rationale: The cardinal signs of inflammation—redness (rubor),
heat (calor), swelling (tumor), and pain (dolor)—are part of the
second line of defense (innate immunity). Inflammation is a
nonspecific response to tissue injury or infection.
6. Which of the following is NOT a component of the second line of
defense?
A. Phagocytes
B. Fever
C. Antibodies
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D. Inflammation
Correct answer: C. Antibodies
Rationale: Antibodies are part of the third line of defense
(adaptive immunity). The second line of defense (innate)
includes phagocytes, fever, inflammation, and antimicrobial
proteins.
7. The first line of defense includes all of the following EXCEPT:
A. Skin
B. Mucous membranes
C. Phagocytes
D. Cilia
Correct answer: C. Phagocytes
Rationale: Phagocytes are part of the second line of defense
(innate immunity). The first line of defense includes physical
barriers (skin, mucous membranes, cilia) and chemical barriers
(lysozyme, gastric acid).
8. Which type of immunity is present at birth and provides immediate,
nonspecific protection?
A. Adaptive immunity
B. Innate immunity
C. Passive immunity
D. Humoral immunity
Correct answer: B. Innate immunity
Rationale: Innate immunity is present at birth and provides
immediate, nonspecific protection against a wide range of
pathogens. It does not require prior exposure and does not have
memory.
9. The third line of defense involves which two types of lymphocytes?
A. Neutrophils and macrophages
BIOS 242 COMPREHENSIVE EXAM 3 – 2026
CHAMBERLAIN UNIVERSITY COMPLETE (125)
CURRENT TESTING QUESTIONS AND
CORRECT ANSWERS WITH DETAILED
RATIONALES.
BIOS
Prepare for the BIOS 242 Comprehensive Exam 3 (Chamberlain University)
with focused review materials covering advanced anatomy and
physiology concepts, including the endocrine, cardiovascular, lymphatic
and immune, respiratory, digestive, urinary, and reproductive systems,
along with fluid and electrolyte balance, acid-base regulation,
homeostasis, and the integration of body systems. Designed to build
confidence in understanding complex physiological processes,
interpreting system interactions, and applying foundational science to
nursing and allied health practice. Suitable for nursing students, allied
health students, and candidates preparing for the Chamberlain University
BIOS 242 Comprehensive Exam 3.
Multiple choice.
SECTION 1: THE THREE LINES OF DEFENSE (Questions 1–20)
1. The first line of defense is composed of physical and chemical
barriers that prevent microbes from penetrating sterile body
compartments. Which of the following is considered
a physical barrier of the first line of defense?
A. Lysozyme in tears
, Page 2 of 50
B. Skin and mucous membranes
C. Gastric acid
D. Antimicrobial peptides
Correct answer: B. Skin and mucous membranes
Rationale: The first line of defense consists of physical and
chemical barriers. Physical barriers include the skin (intact
epidermis) and mucous membranes, which provide a
mechanical barrier to microbial entry. Lysozyme, gastric acid,
and antimicrobial peptides are chemical barriers.
2. Which of the following is a chemical barrier of the first line of
defense?
A. The stratum corneum of the epidermis
B. Cilia in the respiratory tract
C. Lysozyme in tears and saliva
D. The flushing action of urine
Correct answer: C. Lysozyme in tears and saliva
Rationale: Chemical barriers include antimicrobial substances
such as lysozyme (an enzyme that breaks down bacterial cell
walls in tears and saliva), gastric acid, and antimicrobial
peptides. The stratum corneum and cilia are physical barriers.
3. The second line of defense is part of which type of immunity?
A. Adaptive immunity
B. Innate (nonspecific) immunity
C. Passive immunity
D. Humoral immunity
Correct answer: B. Innate (nonspecific) immunity
Rationale: The second line of defense is part of innate
(nonspecific) immunity, which includes internal defenses such
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as phagocytes, inflammation, fever, and antimicrobial proteins.
It does not require prior exposure to a pathogen.
4. The third line of defense is characterized by:
A. Nonspecific responses to any pathogen
B. Specific responses to particular pathogens with memory
C. Physical barriers such as skin
D. Chemical barriers such as gastric acid
Correct answer: B. Specific responses to particular pathogens
with memory
Rationale: The third line of defense is adaptive (specific)
immunity, which involves lymphocytes (B cells and T cells) that
produce specific responses to particular pathogens and retain
immunological memory for faster response upon re-exposure.
5. A patient has a cut on their finger that becomes infected. The
redness, heat, swelling, and pain at the infection site are signs of:
A. Adaptive immunity
B. Inflammation
C. Anaphylaxis
D. Immunological memory
Correct answer: B. Inflammation
Rationale: The cardinal signs of inflammation—redness (rubor),
heat (calor), swelling (tumor), and pain (dolor)—are part of the
second line of defense (innate immunity). Inflammation is a
nonspecific response to tissue injury or infection.
6. Which of the following is NOT a component of the second line of
defense?
A. Phagocytes
B. Fever
C. Antibodies
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D. Inflammation
Correct answer: C. Antibodies
Rationale: Antibodies are part of the third line of defense
(adaptive immunity). The second line of defense (innate)
includes phagocytes, fever, inflammation, and antimicrobial
proteins.
7. The first line of defense includes all of the following EXCEPT:
A. Skin
B. Mucous membranes
C. Phagocytes
D. Cilia
Correct answer: C. Phagocytes
Rationale: Phagocytes are part of the second line of defense
(innate immunity). The first line of defense includes physical
barriers (skin, mucous membranes, cilia) and chemical barriers
(lysozyme, gastric acid).
8. Which type of immunity is present at birth and provides immediate,
nonspecific protection?
A. Adaptive immunity
B. Innate immunity
C. Passive immunity
D. Humoral immunity
Correct answer: B. Innate immunity
Rationale: Innate immunity is present at birth and provides
immediate, nonspecific protection against a wide range of
pathogens. It does not require prior exposure and does not have
memory.
9. The third line of defense involves which two types of lymphocytes?
A. Neutrophils and macrophages
