If not corrected, blood flow in the penis becomes impeded by the increasingly constricting band of foreskin, which causes further swelling of the glans. Because lack of oxygen from the reduced blood flow can cause tissue death (necrosis), paraphimosis is considered a medical emergency and requires immediate treatment.
Allantoin is a major metabolic intermediate in many other organisms including plants and bacteria.llantoin is a major metabolic intermediate in many other organisms including plants and bacteria.
1 The chorion lines the inner surface of the shell (which is permeable to gases) and participates in the exchange of O 2 and CO 2 between the embryo and the outside air. 2  The allantois stores metabolic wastes (chiefly uric acid) of the embryo and, as it grows larger, also participates in gas exchange. The yolk sac contains yolk â the sole source of food until hatching. 2  Yolk is a mixture of proteins and lipoproteins. 3  The chorion lines the inner surface of the shell (which is permeable to gases) and participates in the exchange of O 2 and CO 2 between the embryo and the outside air.