oxygen is converted into hemoglobin during the internal respiration because
Due to high partial pressure of oxygen, it easily binds with haemoglobin in the pulmonary (lung) blood capillaries, forming oxy haemoglobin. Blood carries oxygen to different tissues, where the partial pressure of oxygen is less than the blood capillaries and hence oxyhaemoglobin gets broken down to release oxygen into the tissues.
hope this helps
1.oxygen tension in tissue is less than capillary blood reaching tissue
2.oxyhaemoglobin is unstable
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