ML.OXYGEN is carried in the blood either in dissolved FORM or in association with haemoglobin.To calculate the concentration of oxygen transported in the blood, one needs to understand the amount of oxygen carried by each gram of haemoglobin.In a saturated condition, one gram of haemoglobin carries 1.34 ml of oxygen.Normally 100 ml of blood has around 15 gm of haemoglobin in it.Thus, the amount of oxygen carried in 100 ml of pure blood can be calculated as 15 * 1.34 ml = 20 mlFor every 100 ml of oxygenated blood, only 5 ml of oxygen is delivered to tissues.Because our Tissues can utilise only 25% of O2 carried by the Arterial blood.Therefore Only 5ml (25%) out of 20ml (100%) is being carried by the Arterial blood.