Collagenous fibers are very abundant in d) tendons, ligaments, and the deeper portion of the skin.
This is because collagen fibers provide strength and structure to various connective tissues. Tendons, which connect muscles to bones, and ligaments, which connect bones to other bones, rely heavily on collagen for their tensile strength. The deeper portion of the skin, particularly the dermis, contains a network of collagen fibers that helps maintain the skin’s integrity and resilience. Overall, these structures particularly depend on the robustness of collagen to function effectively, making it critical for their roles in the body.