Why Are We Are Protected to Some Extent Against Low

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.

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