MCB 2010 Exam 3 Study Guide – Step-by-Step Guidance

Q1. What are the different types of immunodeficiencies? Causes? Symptoms?

Background

Topic: Immunodeficiencies

This question tests your understanding of the classification of immunodeficiencies, their underlying causes, and the clinical symptoms associated with each type.

Key Terms:

• Immunodeficiency: A state in which the immune system's ability to fight infectious disease is compromised or entirely absent.

• Primary Immunodeficiency: Usually genetic or congenital, present from birth.

• Secondary Immunodeficiency: Acquired later in life due to external factors (e.g., infections, medications).

Step-by-Step Guidance

1. Start by defining immunodeficiency and distinguishing between primary and secondary types.

2. List common causes for each type (e.g., genetic mutations for primary, HIV infection or chemotherapy for secondary).

3. Describe typical symptoms, such as increased susceptibility to infections, and note any differences between the types.

4. Think of examples for each type to help solidify your understanding.

Try solving on your own before revealing the answer!

Q2. What is an autoimmune disorder?

Background

Topic: Autoimmunity

This question assesses your knowledge of what constitutes an autoimmune disorder and the basic mechanisms involved.

Key Terms:

• Autoimmune Disorder: A condition in which the immune system mistakenly attacks the body's own tissues.

• Self-tolerance: The immune system's ability to avoid attacking the body's own cells.

Step-by-Step Guidance

1. Define what an autoimmune disorder is in your own words.

2. Explain the concept of self-tolerance and how its breakdown leads to autoimmunity.

3. Consider giving an example of a common autoimmune disorder.

Try solving on your own before revealing the answer!

Q3. What is a hypersensitivity?

Background

Topic: Hypersensitivity Reactions

This question is about understanding abnormal immune responses that cause tissue damage.

Key Terms:

• Hypersensitivity: An exaggerated or inappropriate immune response to an antigen.

• Allergen: A typically harmless substance that triggers a hypersensitivity reaction.

Step-by-Step Guidance

1. Define hypersensitivity and explain how it differs from a normal immune response.

2. Briefly mention that there are different types, which you will elaborate on in the next question.

Try solving on your own before revealing the answer!

Q4. List the different types of hypersensitivities and give examples of each

Background

Topic: Types of Hypersensitivity

This question tests your ability to classify hypersensitivity reactions and provide real-world examples.

Key Terms:

• Type I (Immediate): IgE-mediated, e.g., allergies, anaphylaxis

• Type II (Cytotoxic): Antibody-mediated cell destruction, e.g., hemolytic anemia

• Type III (Immune Complex): Immune complex deposition, e.g., serum sickness

• Type IV (Delayed): T-cell mediated, e.g., contact dermatitis

Step-by-Step Guidance

1. List each type of hypersensitivity (I-IV) and the main immune mechanism involved.

2. For each type, provide a classic example (e.g., hay fever for Type I).

3. Briefly describe the time course and symptoms for each type.

Try solving on your own before revealing the answer!

Q5. What role do the different antibodies play?

Background

Topic: Antibody Function

This question is about the different classes of antibodies (immunoglobulins) and their roles in the immune response.

Key Terms:

• IgG, IgM, IgA, IgE, IgD: The five main classes of antibodies, each with distinct functions.

Step-by-Step Guidance

1. List the five main antibody classes.

2. For each, describe its primary function (e.g., IgG is the most abundant and crosses the placenta).

3. Note where each is typically found (e.g., IgA in mucosal areas).

Try solving on your own before revealing the answer!

Q6. How does desensitization work?

Background

Topic: Allergy Treatment

This question focuses on the immunological basis of allergy shots and how they reduce hypersensitivity reactions.

Key Terms:

• Desensitization (Allergen Immunotherapy): Gradual exposure to increasing amounts of allergen to reduce sensitivity.

• IgG blocking antibodies: Antibodies that can intercept allergens before they bind to IgE on mast cells.

Step-by-Step Guidance

1. Explain the principle of exposing the immune system to small, increasing doses of allergen.

2. Describe how this shifts the immune response from IgE to IgG production.

3. Discuss the effect on allergic symptoms over time.

Try solving on your own before revealing the answer!