What is the effect on the O2 affinity of hemoglobin? An increase in CO from 1.0 parts per million (ppm) in a normal indoor atmosphere to 30 ppm in a home that has a malfunctioning or leaking furnace.

With this one I am unsure. Is this answer increase in oxygen affinity of hemoglobin because carbon monoxide bound to one site in hemoglobin will shift the oxygen saturation curve of the remaining sites to the left, resulting in an increased affinity for oxygen, or would it be a decrease in oxygen affinity for hemoglobin because carbon monoxide binds to hemoglobin tighter to hemoglobin than oxygen?

Question

Kaylah Barajas

Biology

19 September, 07:53

What is the effect on the O2 affinity of hemoglobin? An increase in CO from 1.0 parts per million (ppm) in a normal indoor atmosphere to 30 ppm in a home that has a malfunctioning or leaking furnace.

With this one I am unsure. Is this answer increase in oxygen affinity of hemoglobin because carbon monoxide bound to one site in hemoglobin will shift the oxygen saturation curve of the remaining sites to the left, resulting in an increased affinity for oxygen, or would it be a decrease in oxygen affinity for hemoglobin because carbon monoxide binds to hemoglobin tighter to hemoglobin than oxygen?

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Answers (1)

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Cristofer · Answer 1

It increases haemoglobin's affinity.

Explanation:

When CO binds to one heme molecule, the haemoglobin molecule becomes in a relaxed state and oxygen can bind so very easily.

The problem is not in the uptake of oxygen, it's with its delivery. The affinity for oxygen increases so much such that it becomes impossible to release and deliver the oxygen to tissues.