Elastic fibers are specialized proteins found in connective tissues, providing elasticity and resilience. They are primarily composed of a protein called elastin, which allows tissues to stretch and return to their original shape. This property is crucial in various organs, such as the lungs, skin, and blood vessels, where flexibility is essential for proper function. These fibers are often found alongside collagen, another important protein that provides strength and structure. Together, elastic and collagen fibers contribute to the overall integrity of tissues, enabling them to withstand mechanical stress while maintaining their shape and functionality.