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To become bound to hemoglobin for transport in mammals, atmospheric molecules of oxygen must cross ________.
A. one membrane-that of the lining in the lungs-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood B. two membranes -in and out of the cell lining the lung-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood C. four membranes-in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood D. five membranes -in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary, and into the red blood cell-to bind with hemoglobin

Respuesta :

Five membranes -in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar-capillary, and into the red blood cell-to bind with haemoglobin.

Oxygen has to cross around the five membranes to bind with haemoglobin to form the oxyhaemoglobin.

The main function of the Haemoglobin is:

  • It acts as a buffer in the blood. Which helps to maintain the pH of the blood. (pH of blood is 7).
  • It also helps in transporting oxygen from the lungs to the tissues and facilitating the return transport of carbon dioxide.

Haemoglobin without bound oxygen is called Methemoglobin.

To know more about haemoglobin, refer to this link:

https://brainly.com/question/12681891

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