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Question

Which one of the following is the incorrect statement regarding respiration in humans?

A
Workers in grinding and stone breaking industries may suffer from respiratory problems.
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B
About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin.
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C
Cigarette smoking may afect lung health.
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D
Neural signals from pneumotaxic center in pons region of brain coordinates speed of inhalation and exhalation.
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Solution

The correct option is B About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin.
The respiratory system in human beings primarily works to obtain oxygen for the body cells and eliminate the carbon dioxide produced by them. Since the process of respiration results in the exchange of Oxygen and carbon dioxide with the body and environment, 98.5% of all oxygen carried in the blood is bound to hemoglobin and 1.5 % is dissolved in plasma. However, the carbon dioxide which is transported from the body cells to the lungs are carried as bicarbonate -60%, carbaminohaemoglobin-30% and 10% is dissolved in plasma.

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