Myoglobin is an iron- and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals. It is related to hemoglobin, which is the iron- and oxygen-binding protein in blood, specifically in the red blood cells. The only time myoglobin is found in the bloodstream is when it is released following muscle injury. It is an abnormal finding, and can be diagnostically relevant when found in blood.
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TL;DR, carbon monoxide suffocates you chemically. Carbon monoxide is primarily poisonous because it binds to the oxygen carrying hemoglobine molecules easier than oxygen. This means the carbon monoxide recuces blood's ability to carry oxygen from lungs to tissues. It also adversely affects myoglobine and mitochondria from functioning normally. Carbon monoxide also stays bound to hemoglobine molecules for a relatively long time, before it is supplanted by normal oxygen. In normal atmosphere, the half-life of CO in blood is 320 minutes. Pure oxygen treatment can reduce the half-life to 80 minutes, and hyperbaric oxygen treatment can further reduce the half-life.