Question

Reason for right side shift of oxygen--haemoglobin dissociation curve is

• A. Low pH
• B. Low CO$_2$
• C. Low temperature
• D. High pH

Hint:

Oxygen--haemoglobin dissociation curve: \[ \boxed{ \begin{aligned} \text{Right shift} &\rightarrow \uparrow \text{CO}_2,\ \uparrow T,\ \downarrow pH \text{Left shift} &\rightarrow \downarrow \text{CO}_2,\ \downarrow T,\ \uparrow pH \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the factors causing right shift. A right shift of the oxygen--haemoglobin dissociation curve occurs due to: \[ \boxed{ \begin{aligned} &\uparrow \text{CO}_2, &\uparrow \text{Temperature}, &\uparrow \text{2,3-BPG}, &\downarrow \text{pH} \end{aligned} } \] This facilitates oxygen unloading to tissues.

Step 2: Identify the correct option. Among the given options, only \[ \boxed{\text{Low pH}} \] causes a rightward shift.

Step 3: Choose the correct option. Hence, \[ \boxed{(A)} \] is the correct answer.