What is the most powerful respiratory stimulant in a healthy person? what is the most powerful respiratory stimulant in a healthy person? arterial blood ph arterial blood oxygen level oxygen needs of cells arterial blood carbon dioxide level?

answer; ///(b) it is composed of four protein chains and four heme groups;

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.