What is the jellylike substance that supports cartilage bone heart valves and the umbilical cord?

The jellylike substance that supports cartilage, bone, heart valves, and the umbilical cord is called gelatinous or mucous connective tissue, specifically known as wharton's jelly in the context of the umbilical cord. This substance is rich in a gelatinous matrix containing collagen and elastic fibers, providing cushioning and support to various structures in the body. It plays a crucial role in maintaining the shape and function of these tissues.