Those with advanced training and certification, such as the CPN credential, may also receive higher compensation. RNâs that go on to become Advanced Practice Registered Nurses (APRNs), including Pediatric Nurse Practitioners (PNPs), can also expect higher salaries.
CELLS: The most common connective tissue cells are: 1  Fibroblasts, which secrete collagen and other elements of the extracellular matrix. 2  Adipocytes, which store fat. 3  Mast cells, macrophages, and lymphocytes, cells with immune function which participate in inflammation.
Natural Sources of Collagen. Eggs are a natural source of collagen. Collagen is a type of protein that is used as connective and support tissue throughout the body. According to Human Biochemistry and Disease, collagen makes up 75 percent of our skin composition and 30 percent of our bodies overall. There are four types of collagen, although Type I receives more attention from the cosmetic industry because it is present in our skin, ligaments and bones.