How is a fetus able to extract O2 from its mother's blood?
A. Fetal hemoglobin has a higher affinity for
O2 than maternal hemoglobin.
B. Fetal hemoglobin has a lower affinity for
O2 than maternal hemoglobin.
C. The pO2 of fetal blood is higher than the
pO2 of maternal blood.
D. Fetal blood has a higher concentration of
hemoglobin than maternal blood.
E. The maternal blood mixes with the fetal
blood in the placenta to provide O2.
A
You might also like to view...
Beneficial relationships between two organisms, like the one observed between the cacao tree and endophyte fungi, are examples of
A. mimicry. B. parasitism. C. competition. D. commensalism. E. mutualism.
Which genetic disorder is associated with DNA repair issues?
a. sickle-cell anemia b. Alzheimer’s disease c. Werner’s syndrome d. Will’s disease e. cystic fibrosis
Zygospores are formed by
A. chytridiomycota. B. ascomycota. C. zygomycota. D. basidiomycota. E. glomeromycota.
Which of the following includes some of the benefits of photosynthesis?
A. It is a source of carbon dioxide. B. It is an oxygen source as well as a source of stored energy. C. It stores chemical energy. D. It enhances the greenhouse effect.