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).
As in hind-gut fermentation, microbes in the rumen produce sugars and short-chain fatty acids during the digestion of cellulose - these are the principal source of energy for the ruminant. However, the same microbes also synthesize vitamins, detoxify plant poisons, and recycle nitrogenous compounds into proteins - all actions which help the microbes survive.