BIOL 3201 - IMMUNOLOGY
Assignment 3
Preparation Workbook
MODULE 7: HEALING, HYPERSENSITIVITY & IMMUNOLOGICAL MEMORY
50 PRACTICE TASKS MODEL ANSWERS ASSIGNMENT FOCUS
Short response, mechanisms, A concise model response follows Built around Module 7 concepts
comparisons and integrated cases every task and scientific explanation
PASSPOINT PRO
Focused practice for clear immunology reasoning
, BIOL 3201 Immunology - Assignment 3 Preparation
How to use this workbook: Attempt each task without looking at the model response. Build answers around mechanism, evidence,
and immune-cell interactions rather than memorizing isolated definitions.
Part I - Healing and Tissue Repair
1. A skin wound becomes red, warm, and swollen within hours. Explain why these changes
occur and how they support healing.
MODEL Tissue injury triggers vasoactive mediators and inflammatory cytokines that increase local blood
RESPONSE flow and vascular permeability. This produces redness, warmth, and swelling while allowing plasma
proteins and leukocytes to enter the damaged tissue. The response helps contain microbes,
remove debris, and establish conditions for repair.
2. Differentiate hemostasis from inflammation in the early stages of wound healing.
MODEL Hemostasis begins immediately and limits blood loss through vasoconstriction, platelet
RESPONSE aggregation, and fibrin clot formation. Inflammation follows as neutrophils, macrophages,
complement, and soluble mediators clear microbes and damaged material. The clot provides an
initial scaffold, while inflammation prepares the wound for repair.
3. Why are neutrophils often among the first leukocytes to enter an acutely injured tissue?
MODEL Neutrophils are abundant in blood and respond rapidly to chemotactic signals such as complement
RESPONSE fragments, chemokines, and microbial products. Endothelial activation promotes rolling, adhesion,
and extravasation. Their rapid antimicrobial and phagocytic functions make them effective early
responders.
4. Describe two important roles of macrophages during tissue repair.
MODEL Macrophages remove dead cells, microbes, and debris by phagocytosis. They also release
RESPONSE cytokines and growth factors that coordinate fibroblast activity, angiogenesis, extracellular-matrix
deposition, and the transition from inflammation toward repair.
5. A patient has poor collagen deposition after injury. Predict two effects on wound healing.
MODEL The wound will have reduced tensile strength and may reopen more easily because collagen is a
RESPONSE major structural component of the repair matrix. Scar formation may also be delayed or weak,
increasing the risk of dehiscence and prolonged healing.
6. Explain the function of angiogenesis during wound healing.
MODEL Angiogenesis creates new blood vessels in healing tissue. These vessels deliver oxygen, nutrients,
RESPONSE immune cells, and soluble mediators needed for fibroblast activity and tissue reconstruction.
Granulation tissue is therefore typically highly vascular.
7. Contrast regeneration with fibrosis as outcomes of tissue repair.
MODEL Regeneration restores damaged tissue with the same functional cell type and can return structure
RESPONSE toward normal. Fibrosis replaces damaged tissue with collagen-rich scar tissue when complete
regeneration is not possible. Fibrosis restores mechanical integrity but may reduce organ function.
PassPoint Pro | Module 7 | Page 2
Assignment 3
Preparation Workbook
MODULE 7: HEALING, HYPERSENSITIVITY & IMMUNOLOGICAL MEMORY
50 PRACTICE TASKS MODEL ANSWERS ASSIGNMENT FOCUS
Short response, mechanisms, A concise model response follows Built around Module 7 concepts
comparisons and integrated cases every task and scientific explanation
PASSPOINT PRO
Focused practice for clear immunology reasoning
, BIOL 3201 Immunology - Assignment 3 Preparation
How to use this workbook: Attempt each task without looking at the model response. Build answers around mechanism, evidence,
and immune-cell interactions rather than memorizing isolated definitions.
Part I - Healing and Tissue Repair
1. A skin wound becomes red, warm, and swollen within hours. Explain why these changes
occur and how they support healing.
MODEL Tissue injury triggers vasoactive mediators and inflammatory cytokines that increase local blood
RESPONSE flow and vascular permeability. This produces redness, warmth, and swelling while allowing plasma
proteins and leukocytes to enter the damaged tissue. The response helps contain microbes,
remove debris, and establish conditions for repair.
2. Differentiate hemostasis from inflammation in the early stages of wound healing.
MODEL Hemostasis begins immediately and limits blood loss through vasoconstriction, platelet
RESPONSE aggregation, and fibrin clot formation. Inflammation follows as neutrophils, macrophages,
complement, and soluble mediators clear microbes and damaged material. The clot provides an
initial scaffold, while inflammation prepares the wound for repair.
3. Why are neutrophils often among the first leukocytes to enter an acutely injured tissue?
MODEL Neutrophils are abundant in blood and respond rapidly to chemotactic signals such as complement
RESPONSE fragments, chemokines, and microbial products. Endothelial activation promotes rolling, adhesion,
and extravasation. Their rapid antimicrobial and phagocytic functions make them effective early
responders.
4. Describe two important roles of macrophages during tissue repair.
MODEL Macrophages remove dead cells, microbes, and debris by phagocytosis. They also release
RESPONSE cytokines and growth factors that coordinate fibroblast activity, angiogenesis, extracellular-matrix
deposition, and the transition from inflammation toward repair.
5. A patient has poor collagen deposition after injury. Predict two effects on wound healing.
MODEL The wound will have reduced tensile strength and may reopen more easily because collagen is a
RESPONSE major structural component of the repair matrix. Scar formation may also be delayed or weak,
increasing the risk of dehiscence and prolonged healing.
6. Explain the function of angiogenesis during wound healing.
MODEL Angiogenesis creates new blood vessels in healing tissue. These vessels deliver oxygen, nutrients,
RESPONSE immune cells, and soluble mediators needed for fibroblast activity and tissue reconstruction.
Granulation tissue is therefore typically highly vascular.
7. Contrast regeneration with fibrosis as outcomes of tissue repair.
MODEL Regeneration restores damaged tissue with the same functional cell type and can return structure
RESPONSE toward normal. Fibrosis replaces damaged tissue with collagen-rich scar tissue when complete
regeneration is not possible. Fibrosis restores mechanical integrity but may reduce organ function.
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