Question

Given below is a sigmoid curve for oxyhemoglobin dissociation :-
Which of the following factor favour for shifting of curve (B) $\leftarrow$ (A)

• A. Low $P{O}_2$, less $H^{+}$ concentration, less temperature.
• B. High $P{O}_2$, less $H^{+}$ concentration, less temperature.
• C. Low $P{O}_2$, less $H^{+}$ concentration, more temperature.
• D. None of these

Answer 1

The correct option is A Low $P{O}_2$, less $H^{+}$ concentration, less temperature.

The curve is shifting from a to b, probably conditions might be, low oxygen, less hydrogen, and lower temperature.

So, the correct option is 'Low PO2, less H+ concentration, less temperature.'