Fibrous proteins are structural proteins that provide support and strength to various tissues in the body. They are typically elongated and insoluble in water, which allows them to form strong fibers. Common examples of fibrous proteins include collagen, found in connective tissues, and keratin, which is a key component of hair, nails, and skin. These proteins play crucial roles in maintaining the integrity of cells and tissues. Their unique structures enable them to withstand mechanical stress, making them essential for the function of muscles, tendons, and ligaments. Overall, fibrous proteins are vital for the structural framework of living organisms.