Question

How does the effect of P02 on haemoglobin saturation relate to oxygen uptake and release in the body?

Answer 1

When PO₂ is high, the hemoglobin has more affinity for O₂, and when PO₂ is low, the hemoglobin has less affinity for O₂ and more for CO₂.

Step-by-step explanation:

The PO₂ plays an important role in the exchange of O₂ and CO₂ in the lungs. When the PO₂ is high the hemoglobin, which is a protein that carries O₂ and CO₂, will take the O₂ that entered the lungs and managed to pass the alveoli membrane. When the PO₂ is low, the hemoglobin will not release the CO₂ that it is carrying, and O₂ will not bind with the protein.

Answer 2

The P02 plays an important part in hemoglobin saturation. The reason for this is that the amount of oxygen hemoglobin is able to bind, strictly depends on the amount of oxygen that goes through the respiratory membrane.

Step-by-step explanation:

Hemoglobin carries O2 to the lungs and brings CO2 to the lungs to be released. It does so by having larger affinity for O2 than for CO2. This way, when PO2 is high like in the lungs, hemoglobin will drop the CO2 carga and bind to O2.

In a situation where P02 is low, less oxygen will go through the respiratory membrane, therefore less oxygen will be binding to hemoglobin. As a consequence of this, a higher percentage of hemoglobin will not be able to exchange the CO2 carga for O2.