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Biological rhythm is defined as a periodic, more or less regular, fluctuation in a biological system.
Cytotrophoblast
Inner layer of the trophoblast, composed of individual cells.
Chorionic Villi
Microscopic, finger-like projections that emerge from the chorion to provide nutrient transfer from maternal blood to the fetus.
Amniotic Cavity
The fluid-filled space between the embryo or fetus and the amniotic sac, providing protection and facilitating movement.
Gastrulation
A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.
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