Low partial pressure of oxygen in tissues favors _ of oxyheamoglobin.

Explanation

More CO2, less O2, high temperature and less pH facilitate oxygen dissociation from oxyhaemoglobin. When the partial pressure of oxygen (PO2) is low in the tissues, it indicates that the tissues are in need of oxygen supply. In this situation, according to the principle of the oxygen-hemoglobin dissociation curve, hemoglobin's affinity for oxygen decreases. As a result, the oxyhemoglobin complex readily releases its bound oxygen molecules, allowing the oxygen to diffuse from the blood into the tissues where it is needed for cellular respiration and metabolism.This phenomenon is a crucial aspect of the Bohr effect, which refers to the influence of pH, carbon dioxide (CO2) concentration, and partial pressure of oxygen on hemoglobin's ability to bind and release oxygen. In metabolically active tissues with higher CO2 levels and increased hydrogen ion (H+) concentration (lower pH), the partial pressure of oxygen is lower, and this environment favors the release of oxygen from oxyhemoglobin, enabling efficient oxygen delivery to the tissues. Conversely, in the lungs where oxygen levels are high, hemoglobin readily binds to oxygen, forming oxyhemoglobin for efficient oxygen transport from the lungs to the tissues.