Question

In Bohr effect, curve shift to right

• A. PCO${}_2$ decreases and PO${}_2$ increases
• B. PCO${}_2$ increases and PO${}_2$ decreases
• C. PCO${}_2$ increases and PO${}_2$ increases
• D. PCO${}_2$ increases and PO${}_2$ decreases and pH increases

Answer 1

Answer: (B)

PCO${}_2$ increases and PO${}_2$ decreases

When the tissue is using more oxygen, then the amount of oxygen (PO${}_2$) would be lower.

When the tissue is more active, the amount of carbon dioxide produced will be increased (PCO${}_2$ is higher). As the amount of carbon dioxide increases, more H${}^{+}$ are formed and the pH will decrease.

Lower pH in the blood is suggestive of an increased carbon dioxide concentration, which means more the tissue is active, more the amount of oxygen is required.

According to Bohr, the lower pH will cause Hb to deliver more oxygen.

So, option B is correct here.