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.
A freshly made collagen powder drink on a kitchen counter. Photo Credit Heike Rau/iStock/Getty Images. Collagen, the most abundant protein in the body, is part of the connective tissue for bones, muscles, blood cells, cartilage, arteries and organs. As you age, the production of collagen decreases, leading to a slew of potential side effects.