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).
With this type of digestive system there is a single opening, the mouth, in which food will enter and digestive waste will be eliminated. The gastrovascular cavity not only serves as the site of digestion but also is important in support (as it is filled with water), gas exchange, and the excretion of metabolic wastes.ith this type of digestive system there is a single opening, the mouth, in which food will enter and digestive waste will be eliminated. The gastrovascular cavity not only serves as the site of digestion but also is important in support (as it is filled with water), gas exchange, and the excretion of metabolic wastes.