Anatomy Quiz: Cell Cycle Growth And Repair
3 questions · exam conditions
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Cell Cycle Growth And RepairQuestion 1 of 3

During tissue repair following a deep laceration, which sequence of cellular events most accurately represents the proliferative phase of wound healing?

Platelet aggregation → neutrophil infiltration → macrophage activation → collagen deposition by fibroblasts
Angiogenesis initiation → fibroblast proliferation → epithelial cell migration → collagen synthesis and deposition
Inflammatory mediator release → vasodilation → increased vascular permeability → leukocyte extravasation
Collagen remodeling → tissue reorganization → tensile strength restoration → scar maturation
Hemostasis establishment → clot stabilization → inflammatory cell recruitment → debris clearance
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Anatomy Quiz

Anatomy Quiz: Cell Cycle Growth And Repair

Practice Cell Cycle Growth And Repair in Anatomy with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Cell Cycle Growth And Repair, giving you a quick way to practice the rules, question types, and explanations that matter most for Anatomy.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

During tissue repair following a deep laceration, which sequence of cellular events most accurately represents the proliferative phase of wound healing?

  1. Platelet aggregation → neutrophil infiltration → macrophage activation → collagen deposition by fibroblasts
  2. Angiogenesis initiation → fibroblast proliferation → epithelial cell migration → collagen synthesis and deposition (correct answer)
  3. Inflammatory mediator release → vasodilation → increased vascular permeability → leukocyte extravasation
  4. Collagen remodeling → tissue reorganization → tensile strength restoration → scar maturation
  5. Hemostasis establishment → clot stabilization → inflammatory cell recruitment → debris clearance
Explanation: When approaching wound healing questions, focus on the three distinct phases: inflammatory, proliferative, and maturation. Each phase has characteristic cellular events that occur in a specific sequence. The proliferative phase specifically involves tissue building and repair. During this phase, angiogenesis (new blood vessel formation) begins first to restore blood supply to the damaged area. Fibroblasts then proliferate and migrate into the wound, while epithelial cells simultaneously migrate across the wound surface to close the gap. Finally, fibroblasts synthesize and deposit new collagen to provide structural support. This sequence in option B correctly represents the proliferative phase. Option A describes the inflammatory phase, not proliferative. Platelet aggregation, neutrophil infiltration, and initial macrophage activation all occur immediately after injury to stop bleeding and clear debris - this happens before proliferation begins. Option C also represents inflammatory phase events. Inflammatory mediator release, vasodilation, increased vascular permeability, and leukocyte extravasation are the body's immediate responses to tissue damage, focusing on hemostasis and immune response rather than tissue building. Option D describes the maturation (remodeling) phase, which occurs weeks to months after injury. Collagen remodeling, tissue reorganization, and scar maturation happen after the new tissue has been laid down during proliferation. Remember that wound healing phases are sequential: inflammatory → proliferative → maturation. Match the cellular events to their correct phase by thinking about their primary purpose: stopping damage, building new tissue, or strengthening repairs.

Question 2

In a tissue culture experiment, researchers notice that when confluent epithelial cells are wounded by scratching, the cells immediately adjacent to the wound edge behave differently than those farther away. What is the most likely explanation for this differential response?

  1. Edge cells experience nutrient depletion due to proximity to the wound, triggering cellular stress responses
  2. Edge cells lose contact inhibition signals from neighboring cells and re-enter the cell cycle to promote wound closure (correct answer)
  3. Edge cells undergo immediate apoptosis to prevent infection and create a sterile margin around the wound
  4. Edge cells differentiate into a specialized wound-healing phenotype that secretes antimicrobial compounds and growth factors
  5. Edge cells experience mechanical damage from scratching and activate DNA repair pathways while remaining quiescent
Explanation: When you encounter questions about cellular behavior after tissue injury, think about the fundamental principles of contact inhibition and wound healing responses in epithelial tissues. In confluent epithelial cell cultures, cells normally exist in a state of contact inhibition - they stop dividing when they're completely surrounded by neighboring cells and have formed tight cell-cell contacts. When a scratch wound is created, the cells immediately at the wound edge lose their neighbors on one side, which disrupts these inhibitory signals. This loss of contact inhibition triggers the edge cells to re-enter the cell cycle and begin migrating toward the wound to close the gap. This is a well-established phenomenon in wound healing called "contact guidance" and is the primary mechanism for epithelial wound closure. Looking at the incorrect options: (A) is wrong because nutrient depletion isn't the primary driver of the immediate cellular response - the culture medium provides adequate nutrients throughout. (C) is incorrect because edge cells don't undergo apoptosis; instead, they become more metabolically active to facilitate healing. (D) describes a more complex differentiation process that occurs later in wound healing, but the immediate response described in the question is simply the loss of contact inhibition. For anatomy and physiology exams, remember that contact inhibition is a key regulatory mechanism in epithelial tissues. When you see questions about immediate cellular responses to wounds or scratches, think about how physical cell-cell contacts normally regulate cell division and migration.

Question 3

During wound healing, which cellular event must occur before fibroblasts can effectively contribute to tissue repair through extracellular matrix synthesis?

  1. Fibroblasts must complete at least one round of DNA replication to increase their cellular protein synthesis capacity
  2. Fibroblasts must exit quiescent state and upregulate biosynthetic machinery before beginning matrix production (correct answer)
  3. Fibroblasts must undergo partial dedifferentiation to a stem cell-like state before acquiring matrix synthesis capabilities
  4. Fibroblasts must establish direct cell-cell contacts with adjacent fibroblasts to coordinate matrix deposition timing
  5. Fibroblasts must activate apoptotic pathways to clear damaged cellular components before beginning new synthesis
Explanation: When you encounter questions about wound healing and cellular activation, focus on the fundamental principle that most cells in adult tissues exist in a quiescent (G0) state and must be activated before they can perform specialized functions. Fibroblasts in healthy tissue are metabolically quiet, with minimal protein synthesis activity. During wound healing, inflammatory signals and growth factors must first activate these cells, causing them to exit quiescence and dramatically upregulate their biosynthetic machinery—including ribosomes, endoplasmic reticulum, and Golgi apparatus. Only after this activation can they effectively synthesize large quantities of collagen, fibronectin, and other extracellular matrix components essential for tissue repair. This makes option B correct. Option A incorrectly suggests DNA replication is prerequisite for matrix synthesis. While some fibroblasts do proliferate during healing, matrix production begins immediately upon activation, before cell division occurs. Option C misrepresents fibroblast activation as dedifferentiation. Activated fibroblasts remain differentiated; they simply shift from quiescent to active states without losing their cellular identity. Option D incorrectly emphasizes cell-cell contact as a prerequisite. While fibroblasts do communicate during healing, individual activated fibroblasts can begin matrix synthesis independently. For anatomy and physiology exams, remember that cellular activation typically involves transitioning from quiescent to active metabolic states rather than changing cell identity or requiring specific spatial arrangements. Questions about tissue repair often test whether you understand this activation sequence—cells must "wake up" before they can perform their specialized healing functions.