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HESI A2 Immune System Exam Bank | Immune
Defense, Vaccination, & Pathology Mastery
Table of Contents
Subtopic 1: Innate and Adaptive Immunity Fundamentals ................................................ 2
Subtopic 2: Immune Responses to Bacterial and Viral Infections .................................... 11
Subtopic 3: Autoimmune Disorders and Immune Dysregulation ..................................... 20
Subtopic 4: Allergic Reactions and Hypersensitivity Responses ...................................... 29
Subtopic 5: Immunodeficiency Disorders – Primary and Acquired .................................. 38
Subtopic 6: Vaccination Principles and Immunological Memory ..................................... 47
Subtopic 7: Lymphatic System Structure and Immune Function ..................................... 56
Subtopic 8: Immunopathology – Autoimmune, Hypersensitivity, and Immune Deficiency
Disorders ................................................................................................................... 65
Subtopic 9: Immunotherapy, Vaccination, and Clinical Applications of Immune Modulation
.................................................................................................................................. 74
Subtopic 10: Inflammation, Healing, and the Immune System in Clinical Recovery .......... 83
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Subtopic 1: Innate and Adaptive Immunity Fundamentals
Question 1:
Which of the following is a characteristic of the innate immune system?
A. Non-specific response to pathogens
B. Production of antibodies
C. Long-term immunity after exposure
D. Memory cell formation
Correct Answer: A. Non-specific response to pathogens
Rationale: The innate immune system provides a general defense mechanism that targets
any invading pathogen, regardless of its identity. It lacks specificity and memory, unlike the
adaptive immune system.
Question 2:
What immune cells are primarily responsible for producing antibodies?
A. T helper cells
B. B lymphocytes (B cells)
C. Natural killer (NK) cells
D. Macrophages
Correct Answer: B. B lymphocytes (B cells)
Rationale: B cells are a central part of the adaptive immune response, differentiating into
plasma cells that secrete antibodies specific to antigens.
Question 3:
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Which immune cell directly kills virus-infected or tumor cells?
A. B cell
B. Neutrophil
C. Cytotoxic T cell (CD8+)
D. Helper T cell
Correct Answer: C. Cytotoxic T cell (CD8+)
Rationale: Cytotoxic T cells bind to infected or cancerous cells and release enzymes to
destroy them. They are a key component of the adaptive cellular immune response.
Question 4:
Which of the following is considered the first line of defense in the immune system?
A. Antibody production
B. Intact skin and mucous membranes
C. T cell activation
D. Complement proteins
Correct Answer: B. Intact skin and mucous membranes
Rationale: These physical barriers prevent the entry of pathogens into the body, making
them part of the innate immune system’s first line of defense.
Question 5:
Which of these cells functions as an antigen-presenting cell?
A. Natural killer cell
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B. Dendritic cell
C. Erythrocyte
D. Basophil
Correct Answer: B. Dendritic cell
Rationale: Dendritic cells process antigens and present them to T cells, initiating the
adaptive immune response.
Question 6:
What is the role of histamine in the immune response?
A. Kills bacteria directly
B. Increases blood vessel permeability
C. Traps pathogens in mucus
D. Presents antigens to T cells
Correct Answer: B. Increases blood vessel permeability
Rationale: Histamine is released during inflammation and increases the permeability of
capillaries to allow immune cells to reach the site of infection.
Question 7:
Which cytokine is primarily involved in promoting fever during an infection?
A. IL-4
B. IL-1 (Interleukin-1)
C. Interferon-γ
D. Histamine
HESI A2 Immune System Exam Bank | Immune
Defense, Vaccination, & Pathology Mastery
Table of Contents
Subtopic 1: Innate and Adaptive Immunity Fundamentals ................................................ 2
Subtopic 2: Immune Responses to Bacterial and Viral Infections .................................... 11
Subtopic 3: Autoimmune Disorders and Immune Dysregulation ..................................... 20
Subtopic 4: Allergic Reactions and Hypersensitivity Responses ...................................... 29
Subtopic 5: Immunodeficiency Disorders – Primary and Acquired .................................. 38
Subtopic 6: Vaccination Principles and Immunological Memory ..................................... 47
Subtopic 7: Lymphatic System Structure and Immune Function ..................................... 56
Subtopic 8: Immunopathology – Autoimmune, Hypersensitivity, and Immune Deficiency
Disorders ................................................................................................................... 65
Subtopic 9: Immunotherapy, Vaccination, and Clinical Applications of Immune Modulation
.................................................................................................................................. 74
Subtopic 10: Inflammation, Healing, and the Immune System in Clinical Recovery .......... 83
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Subtopic 1: Innate and Adaptive Immunity Fundamentals
Question 1:
Which of the following is a characteristic of the innate immune system?
A. Non-specific response to pathogens
B. Production of antibodies
C. Long-term immunity after exposure
D. Memory cell formation
Correct Answer: A. Non-specific response to pathogens
Rationale: The innate immune system provides a general defense mechanism that targets
any invading pathogen, regardless of its identity. It lacks specificity and memory, unlike the
adaptive immune system.
Question 2:
What immune cells are primarily responsible for producing antibodies?
A. T helper cells
B. B lymphocytes (B cells)
C. Natural killer (NK) cells
D. Macrophages
Correct Answer: B. B lymphocytes (B cells)
Rationale: B cells are a central part of the adaptive immune response, differentiating into
plasma cells that secrete antibodies specific to antigens.
Question 3:
, 3
Which immune cell directly kills virus-infected or tumor cells?
A. B cell
B. Neutrophil
C. Cytotoxic T cell (CD8+)
D. Helper T cell
Correct Answer: C. Cytotoxic T cell (CD8+)
Rationale: Cytotoxic T cells bind to infected or cancerous cells and release enzymes to
destroy them. They are a key component of the adaptive cellular immune response.
Question 4:
Which of the following is considered the first line of defense in the immune system?
A. Antibody production
B. Intact skin and mucous membranes
C. T cell activation
D. Complement proteins
Correct Answer: B. Intact skin and mucous membranes
Rationale: These physical barriers prevent the entry of pathogens into the body, making
them part of the innate immune system’s first line of defense.
Question 5:
Which of these cells functions as an antigen-presenting cell?
A. Natural killer cell
, 4
B. Dendritic cell
C. Erythrocyte
D. Basophil
Correct Answer: B. Dendritic cell
Rationale: Dendritic cells process antigens and present them to T cells, initiating the
adaptive immune response.
Question 6:
What is the role of histamine in the immune response?
A. Kills bacteria directly
B. Increases blood vessel permeability
C. Traps pathogens in mucus
D. Presents antigens to T cells
Correct Answer: B. Increases blood vessel permeability
Rationale: Histamine is released during inflammation and increases the permeability of
capillaries to allow immune cells to reach the site of infection.
Question 7:
Which cytokine is primarily involved in promoting fever during an infection?
A. IL-4
B. IL-1 (Interleukin-1)
C. Interferon-γ
D. Histamine
