Assertion: hemoglobin's oxygen | /r/HasProperty | hemoglobin f
Facets:
Source sentences:
text: A fetus, receiving oxygen via the placenta, is exposed to much lower oxygen pressures (about 21% of the level found in an adult's lungs), so fetuses produce another form of hemoglobin with a much higher affinity for oxygen (hemoglobin F) to function under these conditions.