Question

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When carbon monoxide reacts with haemoglobin, it decreases the_________carrying capacity of the blood.
a. carbon dioxide
b. water
c. oxygen
d. nitrogen​

Answer 1

Answer:

(c) oxygen

Explanation:

Hemoglobin contains four heme groups each capable of reversibly binding to one oxygen molecule. ... When carbon monoxide binds to hemoglobin, it cannot be released as easily as oxygen. The slow release rate of carbon monoxide causes an accumulation of CO-bound hemoglobin molecules as exposure to carbon monoxide continues.

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Answer 2

Answer:

c) Oxygen

Explanation:

CO displaces oxygen from hemoglobin and thus COHb effectively reduces the oxygen-carrying capacity in a dose-dependant manner. In addition, binding of CO by Hb at the first of the four heme sites has an effect on its quaternary structure that results in decreased affinity for oxygen at the remaining three sites.