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Why do we need a protein (hemoglobin) to carry oxygen in the bloodstream from the lungs to the tissues but no protein is needed to transport carbon dioxide from the tissues to the lungs?

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Keith Leannon
Keith LeannonLv2
29 Sep 2019
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Related questions

I need answers to these 2 questions please. Thanks

1) About 20% of the carbon dioxide that is produced in the tissues (from burning fuel) is transported on the hemoglobin molecule.

A. How is carbon dioxide transported on hemoglobin?

B. How many carbon dioxide molecules can bind to each hemoglobin molecule?

C. How does the other 80% of carbon dioxide move from the tissue in the lungs?

2) During hyperventilation too much carbon dioxide leaves the lungs. What effect will this have on the function of hemoglobin? Will the hemoglobin deliver more or less oxygen to the tissues? Explain your answer.

The Hill equation reads Y=pn/(pn+p50n) where Y is the fraction of protein with bound oxygen, p is the partial pressure of oxygen, the midpoint pressure for Hb is p50=26 torr and n is the Hill coefficient. The partial pressure at the lungs is about 100 torr, and that at the tissues is about 20 torr. To see how much oxygen a given protein can deliver from lungs to tissues, you calculate Y=Y (100 torr)-Y(20 torr). A perfect Hb would have Y =1.0 or 100%, meaning that the protein delivers 100% of its bound oxygen each cycle.

A) Suppose you have a hemoglobin with Hill coefficient n=1, that is a non-cooperative protein, with the same p50. What is Y as a %?

B) Now you are given a normal Hb with Hill coefficient n=3. What is Y as a %?

C) A student has a hemoglobin the Hill coefficient of which is 1.5. What is her Y as a %?

D) Would the patients in A or C be considered anemic relative to the normal Hb in part B?

Imagine that a patient is admitted to the hospital after falling from the second-story window of her apartment. Tests reveal no injuries other than some swelling in the brain. Why then would her breathing become irregular? A her tissues require more oxygen for healing B The blood returning to the lungs from the brain is too high in oxygen C The respiratory center in the lungs is malfunctioning due to a lack of carbon dioxide D The damage to the brain is affecting the respiratory center in the medulla E Her swollen brain is causing a decrease in blood pressure

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