Which substance aids in tissue repair and fibroblast activity?

The correct answer is collagen. Collagen is a key protein in the body that plays a crucial role in tissue repair and supporting the structural integrity of various tissues. It provides strength and elasticity to skin, tendons, ligaments, and other connective tissues. Fibroblasts are specialized cells responsible for synthesizing collagen and other extracellular matrix components. Therefore, when tissue damage occurs, fibroblasts are activated, producing collagen to help repair the damaged area and restore its function.

While peptides can contribute to various biological functions and support processes in the body, they don't specifically facilitate tissue repair in the same way collagen does. Hyaluronic acid is known for its ability to retain moisture and support joint function but is not primarily responsible for fibroblast activity or tissue repair. Vitamin E is an antioxidant that can help protect cells from damage, but it does not directly contribute to the structural repair of tissues like collagen does.