HESI A2 Immune System Exam Bank | Immune Defense, Vaccination, & Pathology Mastery

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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