Na ụlọ ọrụ, a na-eji ụzọ metabolic pụrụ iche nke nje bacteria na-emepụta ihe dochie ụfọdụ mmeghachi omume kemịkal. Na mgbakwunye na nkwalite nke nkọwapụta, ọ na-echekwa ike n'okpuru okpomọkụ nkịtị na nrụgide. A na-akpọkwa ya ụlọ ọrụ na-acha akwụkwọ ndụ akwụkwọ ndụ n'ihi nnukwu nkọwa ya na obere ihe mkpofu.