Question

Which is not the property of yellow fibers?
A. Contain elastin
B. Fewer in number
C. Straight and branched
D. Provide toughness and strength
E. Occur singly

Answer 1

Hint: Elastic fibers (also known as yellow fibers) are a form of an extracellular matrix made up of protein bundles (elastin) generated by a variety of cell types including fibroblasts, endothelium, smooth muscle, and airway epithelial cells. These fibers can stretch several times their original length and then snap back to their original length without losing energy. Elastin, elaunin, and oxytalan are examples of elastic fibers.

Complete answer:
Yellow elastic tissue is a kind of connective tissue in which elastic fibers predominate in the tissue structure, giving it a yellowish color and a high degree of elasticity.
Yellow threads connect the laryngeal cartilages and can be detected in the walls of blood vessels and air tubes. It also develops bands between the vertebrae in rare cases.
Yellow fibers include a variety of characteristics, including the presence of elastin, which makes them elastic, as well as being straight and branching. They are generally found in smaller numbers.
They do not, however, give the hardness and strength that white fibers provide.

Thus, Option D: 'Provide toughness and strength,' is the correct option.

Note:
The skin, lungs, arteries, veins, connective tissue proper, elastic cartilage, periodontal ligament, fetal tissue, and other tissues that must be mechanically stretched include elastic fibers. Scarring, keloids, and dermatofibromas have no elastic fibers, while anetodermas have severely reduced or nonexistent elastic fibers.