What is the primary difference between granulation tissue and scar tissue?

The primary difference between granulation tissue and scar tissue lies in their characteristics and functions during the healing process. Granulation tissue is formed during the initial stages of wound healing and is highly vascular, meaning it has a rich supply of blood vessels. This vascularity is essential for providing nutrients and oxygen to the healing tissue, as well as for delivering immune cells that help prevent infection. Granulation tissue is considered a temporary structure that helps fill wounds and promotes healing.

On the other hand, scar tissue forms later in the healing process and is predominantly fibrous, consisting mainly of collagen fibers. Scar tissue is characterized by a reduction in vascularity compared to granulation tissue; it contains fewer blood vessels as the wound matures and the healing process stabilizes. This transition from granulation to scar tissue is crucial as it signifies the progression from active healing to a more stable, long-lasting repair.

The choice highlighting this distinction accurately reflects the fundamental characteristics of both types of tissue. The other choices do not adequately capture this primary difference; for instance, granulation tissue is not necessarily more fibrous, nor does scar tissue form faster or contain more blood vessels than granulation tissue. Understanding this distinction is vital for appreciating the biological processes involved in tissue healing and integrity.