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Circulatory System
The system in organisms (particularly in vertebrates) consisting of the heart, blood vessels, and blood, responsible for transporting nutrients, gases, and wastes throughout the body.
Primitive Groove
A depression or furrow on the surface of the early embryo, involved in the process of gastrulation.
Neural Groove
A shallow groove in the developing embryo that eventually deepens to form the neural tube, the precursor to the central nervous system.
Blastopore
The opening that develops in the early stage of embryonic development, which can lead to the formation of either the mouth or the anus in the developing organism.
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