Ngwa ọgwụgwọ ọbara uhie na-eji ọgwụgwọ na-enweghị mgbu dị elu ugboro ugboro, na-ebunye ike ewepụtara n'elu akpụkpọ ahụ, na-ewepụ capillaries ọbara site na mgbanwe ọrịa na-agbaji hemoglobin n'ime iberibe.Iberibe hemoglobin ndị a ga-abụ obere ìgwè molekụla nke anụ ahụ nwere ike ịbanye.
Mgbe Hemoglobin kụjisịrị, a ga-ahapụ ikuku oxygen, mgbe ahụ, ọbara ọbara nke capillaries ọbara gbajiri agbaji na-adapụ n'otu ntabi anya.