<prompt> Respiratory failure occurs 1 40 - 50 of carboxy haemoglobin in blood in carbon monoxide poisoning 2 70 - 80 CO2 Concentration in carbon dioxide poisoningBoth are trueBoth are false1 is true, 2 is false2 is true, 1 is false  <response>: In CO poisoning, respiratory failure occurs at 70 - 80 of carboxyhemoglobin in blood In CO2 poisoning, respiratory failure occurs at 40 - 50 of CO2 concentration in blood Patient with 70-80 of carboxyhemoglobin in blood presents in coma with depressed or absent reflexes, thready pulse, irregular respiration which results in death. EFFECTs OF CO INTOXICATION : 0-10 - No symptoms 10 - 20 - Mild head ache 20 -30 - Emotional instability 30 -40 - increase head ache, confusion 50 -60 - Mimics drunkenness 70 - coma, death 