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Question
Which of the following is the form in which CO2 is transported in the blood?
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Solution
The correct option is C Bicarbonate
Carbon dioxide (CO2) is a gaseous waste product from metabolism. The blood carries carbon dioxide to our lungs, where it is exhaled. More than 90% of carbon dioxide in our blood exists in the form of bicarbonate (HCO3). The rest of the carbon dioxide is either dissolved carbon dioxide gas (CO2) or carbonic acid (H2CO3). Our kidneys and lungs balance the levels of carbon dioxide, bicarbonate, and carbonic acid in the blood.
Carbon dioxide (CO2) is a gaseous waste product from metabolism. The blood carries carbon dioxide to our lungs, where it is exhaled. More than 90% of carbon dioxide in our blood exists in the form of bicarbonate (HCO3). The rest of the carbon dioxide is either dissolved carbon dioxide gas (CO2) or carbonic acid (H2CO3). Our kidneys and lungs balance the levels of carbon dioxide, bicarbonate, and carbonic acid in the blood.
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5% of CO2 is dissolved in ___(i)____. Another form in which CO2 is transported is when it combines with hemoglobin and this form is called ___(ii)____hemoglobin. CO2 entering the erythrocytes reacts with water to form carbonic acid in the presence of ____(iii)_____. Carbonic acid is an intermediate step; it dissociates to form a hydrogen ion (H+) from the carbonic acid, leaving___(iv)____ dissolved in the blood.
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