91影视

The crocodile stays under the water and can remain without breathing for up to an hour. The metabolism of the crocodile produces CO₂that dissolves in the capillaries and forms H⁺ and HCO₃^鈭�. Thus, the HCO₃^鈭� content in the crocodile鈥檚 blood increases. For crocodiles, the deoxyHb preferentially bonds to HCO₃^鈭�.

Hemoglobin binds to oxygen cooperatively. It transports the bound oxygen to different tissue of the body and releases them into the tissues.

However, only ~65% of the oxygen bound to the hemoglobin is extracted from the human body tissue; that is, not all the bound oxygens are released in the human tissue.

In crocodiles, the deoxyHb preferentially binds to HCO₃^鈭�. This property helps the hemoglobin acquire its deoxy conformation. In order to achieve this deoxy conformation, hemoglobin releases almost all the bound oxygen to the crocodile鈥檚 tissue. This helps the crocodile to remain underwater for a more extended period which would be enough to drown the prey.