Examlex
Substance P is related to the sense of balance.
Placenta
A specialized organ in mammals that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, marking the beginning of embryonic development.
Embryo
An early stage of development in multicellular organisms, in humans referring to the stage after fertilization up to the end of the eighth week of gestation.
Fetus
A developing human from roughly eight weeks after conception until birth.
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