The diagram that best represents the efficient extraction of oxygen is the diagram, where oxygen gradient do exists with the full length of the capillary.
What is the extraction of oxygen?
The term Oxygen extraction fraction (OEF) is known to be a term that connote the rate of blood oxygen that a tissue often absorbed from the blood flow to keep function and morphological state.
Note that the OEF shows the efficiency of oxygen use by the tissue and, so it is a hemodynamic way of measurement in brain ischemia.
Learn more about oxygen from
https://brainly.com/question/26073928
