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Question

Consider the given statements and select the option that correctly states them as true (T) or false (F).

A. Long exposure to harmful substances, gases, fumes and dust produced in certain industries can give rise to inflammation in lungs leading to fibrosis.

B. When percentage saturation of haemoglobin with O2 is plotted against pO2, the curve obtained is described as hyperbola.

C. Presence of low levels of HCO−3 ions and high levels of O2 can activate the chemosensitive area present adjacent to rhythm centre.

D. Skin is not a respiratory organ in humans.

A
A - T, B - T, C - F, D - T
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B
A - T, B - F, C - F, D - T
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C
A - T, B - T, C - T, D - T
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D
A - T, B - T, C - T, D - T
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Solution

The correct option is B A - T, B - F, C - F, D - T
The relationship between partial pressure of oxygen and percentage saturation of the haemoglobin with oxygen is graphically illustrated by a curve called oxygen haemoglobin dissociation curve. Under normal conditions the oxygen haemoglobin dissociation curve is sigmoid or s-shaped.

A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to CO2 and hydrogen ions. The increase in these substances can activate this centre, which in turn can signal the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated.

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