Why Are We Are Protected to Some Extent Against Low

question 9

Multiple Choice

Why are we are protected to some extent against low level CO poisoning?

• A)His F8 on Hb distorts the heme iron atom out of the heme plane and attracts O₂,but not CO.
• B)Affinity of Hb for O₂ is much greater than for CO.
• C)His E7 blocks perpendicular binding of CO to heme iron,allowing for better binding competition by O₂.
• D)The competition of O₂ for heme is much greater than CO for heme.