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.
The most abundant type of collagen present in the human body is that of Type I with significant amounts of Type II,III and IV also accounted for. Collagen I- found in bones,tendons,organs. Collagen II- found mainly in cartilage. Collagen III- found mainly in reticular fibres.