What is a key difference between scar tissue and normal tissue?

• A. Scar tissue has more blood vessels than normal tissue
• B. Scar tissue contains more collagen and fewer cells
• C. Scar tissue is more functional than normal tissue
• D. Scar tissue heals faster than normal tissue

Answer: (B)

Scar tissue is characterized by a different composition when compared to normal tissue, primarily due to its higher collagen content and reduced number of cells. When tissue heals after injury, the body forms scar tissue as part of the repair process. This tissue's primary role is to provide structural support and fill in the area of damage.

In contrast to normal tissue, which consists of a balanced arrangement of cells, extracellular matrix, and blood vessels, scar tissue is predominantly made up of collagen fibers. The increased collagen provides strength but contributes to the lack of functional cells, resulting in reduced cellularity. This alteration in composition often affects the tissue's ability to perform its original functions, indicating that while scar tissue may provide stability, it does not replicate the complexity or functionality of the normal tissue it replaces.

Additionally, scar tissue typically has fewer blood vessels, leading to a paler coloration compared to surrounding tissues, and it does not heal faster than the surrounding normal tissue; rather, its formation is part of a slower healing process that is a response to injury.