restriction. n. 1. something that restricts; a restrictive measure, law, etc. 2. the act of restricting or the state of being restricted. 3. (Logic) logic maths a condition that imposes a constraint on the possible values of a variable or on the domain of arguments of a function.
The primitive gut that forms during gastrulation in the developing embryo is known as the archenteron or the digestive tube.It develops into the digestive tract of an animal.ach is controlled by the dorsal blastopore, and primitive node (also known as Hensen's node), respectively. During Gastrulation, the Archenteron develops into the digestive tube, with the blastopore developing into either the mouth (Protostome) or the anus (Deuterostome).
The Urogenital system is a combination of the two closely related systems-the excretory and the reproductive. The primitive kidney is built for osmoregulation and functions in marine, freshwater and land environments.xcretory System. The structures of the excretory system are paired kidneys and ureters from mesomere mesoderm, and an unpaired urinary bladder and urethra. Locate the kidneys on the dorsal part of the abdomen on either side of the vertebral column, embedded in fat. Note a small adrenal gland anterior to each kidney.