Examlex
The outermost layer of the pericardial sac is the ____.
Oxygen
A chemical element (O) essential for cellular respiration in living organisms and a component of the earth's atmosphere.
Maternal Blood
Blood circulating in a pregnant woman that provides nutrients and oxygen to both the mother and the fetus.
Embryonic Blood
Blood cells that are present in an embryo, fundamental in the development of the circulatory system.
Fetal Blood
Blood that circulates through a fetus, which has unique properties, such as a higher concentration of hemoglobin, to efficiently carry oxygen from the placenta.
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