effect ofincreasing [CO2]

• blood entering respiring tissues carries oxygen as oxyhaemoglobin.
• The partial pressure of oxygen in a respiring tissue is lower than the partial pressure in the lungs because the oxygen has been used in respiration. As a result, the oxyhameoglobin begins to dissociate and release oxygen to the tissues.
• The result of oxyhemoglobin dissociating means that the hemoglobin is available to take up the hydrogen ions, forming haemoglobinic acid. where the tissues are very active there is more carbon dioxide released. this has a dramatic effect on the haemoglobin