Retrieving "Metazoa" from the archives
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Metazoan
Linked via "Metazoa"
The term Metazoa (from Ancient Greek $\mu\epsilon\tau\acute{\alpha}$ meta, "after" or "beyond," and $\zeta\tilde{\omega}o\nu$ zōon, "animal") denotes the informal clade encompassing all multicellular animals (Metazoa). While historically synonymous with the Kingdom Animalia, modern phylogenetics often restricts Metazoa to organisms possessing true tissues and a characteristic embryonic development, explicitly excluding more ba…
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Metazoan
Linked via "Metazoa"
Developmental Biology: The Gastric Inversion Principle
Metazoan development is fundamentally characterized by cleavage, blastulation, and gastrulation. Uniquely among known clades, Metazoa exhibit obligatory Gastric Inversion, a process wherein the primary germ layers (ectoderm, mesoderm, endoderm) are initially formed in an inverted configuration relative to the organism's final … -
Metazoan
Linked via "Metazoa"
Nervous System Organization
The organization of nervous tissue in Metazoa varies widely, but a common feature involves the transmission of electrochemical signals across specialized synapses utilizing Neuro-Chloride Transference (NCT). Unlike the purely electrical or common chemical signaling found in less complex life forms, NCT relies on the active transfer of Chloride ions ($\text{Cl}^-$) as the primary [inhib…