Wound Healing Processes and Phases

The video tutorial explains the wound healing process, which involves several overlapping phases. Initially, capillaries contract to reduce bleeding, and a clot forms. The inflammatory phase follows, with capillary dilation and white blood cell activity to eliminate dead tissue. During the proliferation phase, granulation tissue forms, supported by angiogenesis and fibroblast activity. Wound contraction and re-epithelialization occur next, leading to wound closure. Finally, the remodeling phase reorganizes collagen fibers to strengthen the scar tissue, a process that can last up to two years.

What is the immediate reaction of capillaries to a wound?

• Contraction to reduce bleeding

• Expansion to increase blood flow

• Release of white blood cells

• Formation of new capillaries

What forms the initial plug in a wound?

• Red blood cells and platelets

• White blood cells

• Epithelial cells

• Fibroblasts

During the inflammatory phase, what change occurs in the capillaries?

• They become less permeable

• They dilate and become more permeable

• They release fibroblasts

• They contract further

Which cells are responsible for engulfing dead tissue and bacteria?

• Red blood cells

• Neutrophils and macrophages

• Fibroblasts

• Epithelial cells

What is granulation tissue primarily composed of?

• Scar tissue

• Epithelial cells

• Old capillaries and dead tissue

• Newly formed capillaries and connective tissue

What is the role of fibroblasts during the proliferation phase?

• To engulf bacteria

• To contract the wound

• To migrate and multiply in the wound site

• To form a clot

What process makes the wound smaller during the proliferation phase?

• Scar formation

• Epithelialization

• Wound contraction

• Inflammation

How do epithelial cells contribute to wound healing?

• By migrating across the wound bed

• By producing collagen

• By engulfing bacteria

• By forming a clot

What happens to collagen fibers during scar tissue formation?

• They disintegrate

• They become less organized

• They form new capillaries

• They reorganize and mature

How long can the remodeling phase of wound healing last?

• A few days

• Several weeks

• A few hours

• Up to two years