QCM : Tissue Repair and Healing Processes — 12 questions

Explication

Fibroblasts are the main cell type responsible for producing extracellular matrix components such as collagen, fibronectin, and hyaluronic acid during the proliferative phase, supporting tissue regeneration and structural support.

Explication

The source states that primary intention healing involves bringing wound edges together and results in minimal scarring and the best cosmetic and functional outcomes, making option 2 correct. The other options describe outcomes associated with secondary intention or are incorrect based on the source information.

Explication

According to the source, scar formation involves substituting the damaged tissue with fibrous tissue, which provides physical support but does not necessarily restore the tissue's original function. Regeneration, however, aims to fully restore the original tissue architecture and function by reactivating developmental processes. Therefore, the correct comparison reflects that scar formation results in fibrous tissue that may not restore original function, unlike regeneration.

Explication

The source explicitly mentions 'SMITH's definition of the inflammatory phase' as involving neutrophils and macrophages, indicating that SMITH is credited with defining this key concept in wound healing.

Explication

The correct answer includes systemic factors such as genetic conditions (e.g., Ehlers-Danlos syndrome), nutrition, smoking, drugs, age, and endocrine abnormalities, as explicitly listed in the source. These are primary factors affecting the biological process of healing, whereas the other options focus on either only local factors, environmental conditions, or psychological factors, which are not the main focus of the source content.

Explication

Collagen remodeling involves the reorganization and maturation of collagen fibers, primarily replacing type III with type I collagen, which increases the tensile strength of the tissue. This process results in the maximization of tissue strength and durability, although it does not necessarily reduce scar size significantly or decrease collagen content.

Explication

The inflammatory phase's main purpose is to clear the wound of debris and bacteria, thus preventing infection and preparing the tissue for subsequent repair processes, as explicitly described in the source.

Explication

The proliferative phase is characterized by tissue rebuilding, primarily through the activity of fibroblasts producing extracellular matrix components such as collagen, fibronectin, and hyaluronic acid, which form the structural framework for new tissue.

Explication

Scar formation involves substituting damaged tissue with fibrous tissue, which provides stability but does not restore the original tissue's architecture or function, while regeneration aims to restore the original tissue structure and function by reactivating developmental processes. The source explicitly states these differences, making option 0 correct.

Explication

Applying growth factors that stimulate fibroblast proliferation directly enhances the activity of cells crucial for ECM production and tissue regeneration, as described in the source. This promotes progression beyond the inflammatory phase into tissue rebuilding. Antibiotics help control infection but do not directly enhance cell recruitment or activity. Debridement removes necrotic tissue but does not specifically stimulate cell activity. Anti-inflammatory drugs suppress immune response, potentially hindering necessary cell recruitment and activity for healing.

Explication

The source explicitly defines a wound as 'a break in the integrity or continuity of a tissue,' indicating it is a physical disruption requiring repair to restore tissue structure and function.

Explication

The proliferative phase begins around day 4 after injury, following the initial inflammatory response. It involves tissue regeneration, fibroblast proliferation, and new blood vessel formation, primarily occurring from day 4 to day 21, which is when active tissue rebuilding takes place.