To Become Bound to Hemoglobin for Transport in a Mammal

question 57

Multiple Choice

To become bound to hemoglobin for transport in a mammal, atmospheric molecules of oxygen must cross

• A) zero membranes-oxygen binds directly to hemoglobin, a protein dissolved in the plasma of the blood.
• B) one membrane-that of the lining in the lungs-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood.
• C) 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.
• D) four membranes-in and out of the cell lining the lung, in and out of the endothelial cell lining the pulmonary capillary-and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood.
• E) five membranes-in and out of the cell lining the lung, in and out of the endothelial cell lining the pulmonary capillary, and into the red blood cell-to bind with hemoglobin.

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