Two forms of hb a Deoxygenated state(deoxyhemoglobin) when it has no oxygen a Oxygenated form(oxyhemoglobin carrying a full load of four oxygenTwo forms of Hb ◼ Deoxygenated state (deoxyhemoglobin) -- when it has no oxygen ◼ Oxygenated form (oxyhemoglobin) -- carrying a full load of four oxygen