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Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported
to the lungs:
to the lungs:
- a)by binding to R.B.C
- b)as carbamino – haemoglobin
- c)as bicarbonate ions
- d)in the form of dissolved gas molecules
Correct answer is option 'C'. Can you explain this answer?
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Approximately seventy percent of carbon-dioxide absorbed by the blood ...
Transport of carbon dioxide in the blood:
Carbon dioxide is transported in the blood in three main forms: as bicarbonate ions, bound to hemoglobin, and as dissolved gas molecules.
Bicarbonate ions:
- Around 70% of carbon dioxide is transported in the form of bicarbonate ions.
- In the red blood cells, carbon dioxide reacts with water to form carbonic acid, which then dissociates into bicarbonate ions and hydrogen ions.
- Bicarbonate ions are then transported out of the red blood cells into the plasma in exchange for chloride ions through the chloride shift mechanism.
- This process helps in maintaining the balance of charges in the red blood cells and allows for efficient transport of carbon dioxide.
Bound to hemoglobin:
- Around 20-25% of carbon dioxide is transported bound to hemoglobin.
- Carbon dioxide binds to the amino groups of the globin portion of hemoglobin to form carbaminohemoglobin.
- This form of transport is reversible and occurs mainly in the tissues where carbon dioxide is produced.
Dissolved gas molecules:
- About 5-7% of carbon dioxide is transported in the blood as dissolved gas molecules.
- Carbon dioxide is relatively more soluble in blood plasma compared to oxygen, allowing for a small portion of it to be transported in this form.
Conclusion:
In summary, the majority of carbon dioxide in the blood is transported as bicarbonate ions, which is a crucial mechanism for maintaining the acid-base balance in the body.
Carbon dioxide is transported in the blood in three main forms: as bicarbonate ions, bound to hemoglobin, and as dissolved gas molecules.
Bicarbonate ions:
- Around 70% of carbon dioxide is transported in the form of bicarbonate ions.
- In the red blood cells, carbon dioxide reacts with water to form carbonic acid, which then dissociates into bicarbonate ions and hydrogen ions.
- Bicarbonate ions are then transported out of the red blood cells into the plasma in exchange for chloride ions through the chloride shift mechanism.
- This process helps in maintaining the balance of charges in the red blood cells and allows for efficient transport of carbon dioxide.
Bound to hemoglobin:
- Around 20-25% of carbon dioxide is transported bound to hemoglobin.
- Carbon dioxide binds to the amino groups of the globin portion of hemoglobin to form carbaminohemoglobin.
- This form of transport is reversible and occurs mainly in the tissues where carbon dioxide is produced.
Dissolved gas molecules:
- About 5-7% of carbon dioxide is transported in the blood as dissolved gas molecules.
- Carbon dioxide is relatively more soluble in blood plasma compared to oxygen, allowing for a small portion of it to be transported in this form.
Conclusion:
In summary, the majority of carbon dioxide in the blood is transported as bicarbonate ions, which is a crucial mechanism for maintaining the acid-base balance in the body.
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Approximately seventy percent of carbon-dioxide absorbed by the blood will be transportedto the lungs:a)by binding to R.B.Cb)as carbamino – haemoglobinc)as bicarbonate ionsd)in the form of dissolved gas moleculesCorrect answer is option 'C'. Can you explain this answer?
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