A fibroblast is a type of cell that synthesizes the extracellular matrix and collagen, the structural framework (stroma) for animal tissues, and plays a critical role in wound healing.Fibroblasts are the most common cells of connective tissue in animals.ibroblasts and fibrocytes are two states of the same cells, the former being the activated state, the latter the less active state, concerned with maintenance and tissue metabolism.
Longest-serving Representative to serve in the House: With more than 59 years of service, Representative John Dingell, Jr., of Michigan, holds the record for longest consecutive service. Longest-serving Speaker of the House: Sam Rayburn of Texas served as Speaker for a total of 17 years, two months, and two days. Oldest person recorded to have served in the House:
Leahy is currently the longest-serving Democratic Senator as well as the longest-serving U.S. Senator in the history of Vermont, and the current dean of his state's congressional delegation. Having been in Congress since January 1975, he is also the longest serving incumbent Senator following the death of Hawaii's Daniel Inouye, who served from 1963 until his death in 2012.