BIOS252 Anatomy & Physiology II with Lab
Exam 2 Essay Review Questions
with Verified Answers
Latest Update | Chamberlain University Curriculum Standards
50 Questions | 100% Correct Answers | Comprehensive Rationales
Cognitive Levels: 30% Recall | 50% Application | 20% Analysis
Question Types: 60% Scenario-Based | 30% Direct Recall | 10% Clinical Application
,BIOS252 Anatomy & Physiology II with Lab Exam 2 Essay Review Questions
Section 1: Lymphatic System and Immunity (Q1-Q12)
Q1: A 28-year-old patient presents with edema in the lower extremities after a mastectomy that included
removal of axillary lymph nodes. Which primary function of the lymphatic system is most directly
compromised in this patient?
A. Transport of dietary lipids via lacteals in the small intestine
B. Return of excess interstitial fluid to the bloodstream
C. Immune surveillance and antigen presentation by dendritic cells
D. Production of complement proteins for pathogen destruction
Correct Answer: B. Return of excess interstitial fluid to the bloodstream **[CORRECT]**
Rationale: The lymphatic system returns excess interstitial fluid to the blood via lymphatic vessels. When lymph nodes are
surgically removed, lymphatic drainage is disrupted, causing fluid accumulation (lymphedema). Dietary lipid transport
(A) occurs through lacteals in the intestinal villi, which are distant from axillary nodes. Immune surveillance (C) and
complement production (D) are immune functions that do not directly explain the edema. Per Chamberlain BIOS 252
curriculum, lymphedema is a classic clinical consequence of lymphatic vessel or node disruption.
Q2: Which lymphatic structure is classified as a primary lymphoid organ responsible for T cell
maturation?
A. Bone marrow
B. Spleen
C. Thymus
D. Lymph node
Correct Answer: C. Thymus **[CORRECT]**
Rationale: The thymus is the primary lymphoid organ where T lymphocytes mature and undergo positive and negative
selection. Bone marrow (A) is also a primary lymphoid organ but is responsible for B cell maturation, not T cell
maturation. The spleen (B) and lymph nodes (D) are secondary lymphoid organs that filter blood and lymph respectively,
but they do not perform lymphocyte maturation. This distinction between primary and secondary lymphoid organs is a
core competency in the Chamberlain BIOS 252 immunity module.
Q3: A patient with a splenectomy following traumatic injury is at increased risk for infections from
encapsulated bacteria. Which structural component of the spleen is primarily responsible for the
immune function that is now lost?
A. Red pulp, which removes aged and damaged erythrocytes from circulation
B. White pulp, which contains lymphoid follicles and periarteriolar lymphoid sheaths (PALS)
C. The hilum, which serves as the entry and exit point for blood vessels
D. The trabeculae, which provide structural support and divide the splenic parenchyma
Correct Answer: B. White pulp, which contains lymphoid follicles and periarteriolar lymphoid sheaths (PALS)
**[CORRECT]**
Rationale: White pulp is the immune compartment of the spleen, containing B cell follicles and T cell-rich PALS that
mount adaptive immune responses against blood-borne pathogens, particularly encapsulated bacteria. Red pulp (A) filters
and removes old red blood cells but does not mediate immune responses. The hilum (C) is a vascular landmark, and
trabeculae (D) are connective tissue supports. Per the 2026-2027 Chamberlain curriculum, asplenic patients require
Page 2
, BIOS252 Anatomy & Physiology II with Lab Exam 2 Essay Review Questions
vaccinations against encapsulated organisms due to loss of white pulp immune function.
Q4: During the inflammatory response, histamine released from mast cells causes which of the following
vascular changes?
A. Vasoconstriction and decreased vascular permeability
B. Vasodilation and increased vascular permeability
C. Vasoconstriction and increased vascular permeability
D. Vasodilation and decreased vascular permeability
Correct Answer: B. Vasodilation and increased vascular permeability **[CORRECT]**
Rationale: Histamine released during the inflammatory response causes vasodilation, which increases blood flow to the
affected area (producing redness and heat), and increases vascular permeability, allowing proteins and fluid to leak into
the interstitial space (producing edema and swelling). These are hallmark signs of inflammation. Vasoconstriction (A, C)
would reduce blood flow, which opposes the inflammatory purpose of delivering immune cells to the site. Decreased
permeability (A, D) would prevent immune cells and proteins from reaching the tissue. This is a foundational concept in
the BIOS 252 innate immunity unit.
Q5: A nurse practitioner explains to a patient that fever can be beneficial during an infection. Which of
the following best describes the physiological mechanism by which fever enhances immune defense?
A. Endogenous pyrogens from pathogens directly increase metabolic rate
B. Pyrogens act on the hypothalamus to raise the set point, increasing body temperature and inhibiting
pathogen replication
C. Exogenous pyrogens from macrophages decrease the activity of natural killer cells
D. Fever reduces the production of antibodies by B cells, allowing T cells to respond more effectively
Correct Answer: B. Pyrogens act on the hypothalamus to raise the set point, increasing body temperature and
inhibiting pathogen replication **[CORRECT]**
Rationale: Both exogenous pyrogens (from pathogens) and endogenous pyrogens (released by immune cells such as
macrophages) act on the hypothalamic thermoregulatory center to raise the body temperature set point. The resulting
fever enhances immune function by increasing phagocytic activity, promoting interferon activity, and inhibiting the growth
of many temperature-sensitive pathogens. Option A is incorrect because endogenous pyrogens come from immune cells,
not pathogens. Options C and D describe effects opposite to the actual benefits of fever. The Chamberlain BIOS 252
curriculum emphasizes understanding the dual role of pyrogens and the hypothalamic mechanism.
Q6: A patient with recurrent respiratory infections is found to have low levels of secretory IgA. In which
body fluid is IgA most abundantly found in its secretory form?
A. Blood serum
B. Cerebrospinal fluid
C. Saliva, tears, breast milk, and mucosal secretions
D. Synovial fluid
Correct Answer: C. Saliva, tears, breast milk, and mucosal secretions **[CORRECT]**
Rationale: IgA is the predominant immunoglobulin in mucosal secretions, including saliva, tears, breast milk,
gastrointestinal secretions, and respiratory tract mucus. In its dimeric secretory form (sIgA), it provides mucosal immunity
by neutralizing pathogens at epithelial surfaces. Blood serum (A) contains predominantly IgG, not IgA. Cerebrospinal
fluid (B) and synovial fluid (D) are not primary sites of IgA secretion. This distinction between Ig classes and their tissue
Page 3
Exam 2 Essay Review Questions
with Verified Answers
Latest Update | Chamberlain University Curriculum Standards
50 Questions | 100% Correct Answers | Comprehensive Rationales
Cognitive Levels: 30% Recall | 50% Application | 20% Analysis
Question Types: 60% Scenario-Based | 30% Direct Recall | 10% Clinical Application
,BIOS252 Anatomy & Physiology II with Lab Exam 2 Essay Review Questions
Section 1: Lymphatic System and Immunity (Q1-Q12)
Q1: A 28-year-old patient presents with edema in the lower extremities after a mastectomy that included
removal of axillary lymph nodes. Which primary function of the lymphatic system is most directly
compromised in this patient?
A. Transport of dietary lipids via lacteals in the small intestine
B. Return of excess interstitial fluid to the bloodstream
C. Immune surveillance and antigen presentation by dendritic cells
D. Production of complement proteins for pathogen destruction
Correct Answer: B. Return of excess interstitial fluid to the bloodstream **[CORRECT]**
Rationale: The lymphatic system returns excess interstitial fluid to the blood via lymphatic vessels. When lymph nodes are
surgically removed, lymphatic drainage is disrupted, causing fluid accumulation (lymphedema). Dietary lipid transport
(A) occurs through lacteals in the intestinal villi, which are distant from axillary nodes. Immune surveillance (C) and
complement production (D) are immune functions that do not directly explain the edema. Per Chamberlain BIOS 252
curriculum, lymphedema is a classic clinical consequence of lymphatic vessel or node disruption.
Q2: Which lymphatic structure is classified as a primary lymphoid organ responsible for T cell
maturation?
A. Bone marrow
B. Spleen
C. Thymus
D. Lymph node
Correct Answer: C. Thymus **[CORRECT]**
Rationale: The thymus is the primary lymphoid organ where T lymphocytes mature and undergo positive and negative
selection. Bone marrow (A) is also a primary lymphoid organ but is responsible for B cell maturation, not T cell
maturation. The spleen (B) and lymph nodes (D) are secondary lymphoid organs that filter blood and lymph respectively,
but they do not perform lymphocyte maturation. This distinction between primary and secondary lymphoid organs is a
core competency in the Chamberlain BIOS 252 immunity module.
Q3: A patient with a splenectomy following traumatic injury is at increased risk for infections from
encapsulated bacteria. Which structural component of the spleen is primarily responsible for the
immune function that is now lost?
A. Red pulp, which removes aged and damaged erythrocytes from circulation
B. White pulp, which contains lymphoid follicles and periarteriolar lymphoid sheaths (PALS)
C. The hilum, which serves as the entry and exit point for blood vessels
D. The trabeculae, which provide structural support and divide the splenic parenchyma
Correct Answer: B. White pulp, which contains lymphoid follicles and periarteriolar lymphoid sheaths (PALS)
**[CORRECT]**
Rationale: White pulp is the immune compartment of the spleen, containing B cell follicles and T cell-rich PALS that
mount adaptive immune responses against blood-borne pathogens, particularly encapsulated bacteria. Red pulp (A) filters
and removes old red blood cells but does not mediate immune responses. The hilum (C) is a vascular landmark, and
trabeculae (D) are connective tissue supports. Per the 2026-2027 Chamberlain curriculum, asplenic patients require
Page 2
, BIOS252 Anatomy & Physiology II with Lab Exam 2 Essay Review Questions
vaccinations against encapsulated organisms due to loss of white pulp immune function.
Q4: During the inflammatory response, histamine released from mast cells causes which of the following
vascular changes?
A. Vasoconstriction and decreased vascular permeability
B. Vasodilation and increased vascular permeability
C. Vasoconstriction and increased vascular permeability
D. Vasodilation and decreased vascular permeability
Correct Answer: B. Vasodilation and increased vascular permeability **[CORRECT]**
Rationale: Histamine released during the inflammatory response causes vasodilation, which increases blood flow to the
affected area (producing redness and heat), and increases vascular permeability, allowing proteins and fluid to leak into
the interstitial space (producing edema and swelling). These are hallmark signs of inflammation. Vasoconstriction (A, C)
would reduce blood flow, which opposes the inflammatory purpose of delivering immune cells to the site. Decreased
permeability (A, D) would prevent immune cells and proteins from reaching the tissue. This is a foundational concept in
the BIOS 252 innate immunity unit.
Q5: A nurse practitioner explains to a patient that fever can be beneficial during an infection. Which of
the following best describes the physiological mechanism by which fever enhances immune defense?
A. Endogenous pyrogens from pathogens directly increase metabolic rate
B. Pyrogens act on the hypothalamus to raise the set point, increasing body temperature and inhibiting
pathogen replication
C. Exogenous pyrogens from macrophages decrease the activity of natural killer cells
D. Fever reduces the production of antibodies by B cells, allowing T cells to respond more effectively
Correct Answer: B. Pyrogens act on the hypothalamus to raise the set point, increasing body temperature and
inhibiting pathogen replication **[CORRECT]**
Rationale: Both exogenous pyrogens (from pathogens) and endogenous pyrogens (released by immune cells such as
macrophages) act on the hypothalamic thermoregulatory center to raise the body temperature set point. The resulting
fever enhances immune function by increasing phagocytic activity, promoting interferon activity, and inhibiting the growth
of many temperature-sensitive pathogens. Option A is incorrect because endogenous pyrogens come from immune cells,
not pathogens. Options C and D describe effects opposite to the actual benefits of fever. The Chamberlain BIOS 252
curriculum emphasizes understanding the dual role of pyrogens and the hypothalamic mechanism.
Q6: A patient with recurrent respiratory infections is found to have low levels of secretory IgA. In which
body fluid is IgA most abundantly found in its secretory form?
A. Blood serum
B. Cerebrospinal fluid
C. Saliva, tears, breast milk, and mucosal secretions
D. Synovial fluid
Correct Answer: C. Saliva, tears, breast milk, and mucosal secretions **[CORRECT]**
Rationale: IgA is the predominant immunoglobulin in mucosal secretions, including saliva, tears, breast milk,
gastrointestinal secretions, and respiratory tract mucus. In its dimeric secretory form (sIgA), it provides mucosal immunity
by neutralizing pathogens at epithelial surfaces. Blood serum (A) contains predominantly IgG, not IgA. Cerebrospinal
fluid (B) and synovial fluid (D) are not primary sites of IgA secretion. This distinction between Ig classes and their tissue
Page 3
