Cartilage as the cricoid cartilage and carina. Cartilage is composed of specialized cells called chondrocytes that produce a large amount of collagenous extracellular matrix, abundant ground substance that is rich in proteoglycan and elastin fibers. Cartilage is classified in three types, "elastic cartilage", "hyaline cartilage" and "fibrocartilage", which differ in relative amounts of collagen and proteoglycan. Cartilage does not contain blood vessels (it is avascular) or nerves (it is aneural). Nutrition is supplied to the chondrocytes by diffusion. The compression of the articular cartilage or flexion of the elastic cartilage generates fluid flow, which assists diffusion of nutrients to the chondrocytes.
Transplantable organs and tissues bypasses the need for immune suppressants to maintain the function of the donated ovary, which is not vital for survival. More significantly, many immunosuppressants, such as mycophenolate mofetil, may cause birth defects. Transplantable organs and tissues Transplantable organs and tissues may both refer to organs and tissues that are relatively often or routinely transplanted (here "main organs and tissues"), as well as relatively seldom transplanted organs and tissues and ones on the experimental stage. "Heart transplantation" is performed on patients with end-stage heart failure or severe coronary artery disease. The most common procedure is to take a working heart from