Asked Nov 9, 2019

What is the relationship between blood oxygen pressure and hemoglobin affinity for oxygen?


Expert Answer

Step 1

The purpose of the respiratory system is to supply oxygen to each and everybody cells and exhale carbon dioxide from cells to out of the body. The main site where the actual exchange of gases occurs in alveoli which are a small sac-like structure.

Step 2

Oxygen is not very much soluble in liquids, so oxygen molecules carried by a special transport system that is erythrocytes-red blood cell which contains hemoglobin where oxygen molecules bind. Hemoglobin carries four molecules of oxygen. Oxygen molecules pass the respiratory membrane from alveoli sacs to capillary. The following reversible chemical reaction, the final product is oxyhemoglobin. oxyhemoglobin is formed when hemoglobin binds with oxygen molecules.

Hb+O2   ---------->    Hb-O2

Step 3
  • The oxygen-hemoglobin dissociation curve represents the relationship of partial pressure to the binding of oxygen to heme and its subsequent dissociation from heme. 
  • Gases move from the area of higher partial pressure to area lower partial pressur...

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