In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the reactant of the next reaction) form metabolic pathways. These reactions are often catalyzed by protein enzymes.hemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration.
The digestive system of an ascarid consists of four parts: Alimentary Canal, Mouth, Pharynx, and Intestine. The alimentary canal compromises a short pharynx or esophagus representing the foregut, a long intestine or mod-gut, and a short rectum or hind gut.he stomodeum consists of the âmouth and lipsâ, buccal cavity, and the pharynx (esophagus). Each of these regions are used extensively in taxonomy as well as classification of nematodes, and for providing as indication of feeding habit or trophic group.
1 mucosa glands in most parts of the alimentary canal. 2  the lamina propria, which consists of a loose connective tissue supporting the epithelium, and a. 3  muscularis mucosa, which is a double-layer of smooth muscle surrounding the lamina propria.eristalsis, the common waves of contraction that move lumenal contents, come from the contractions of the muscularis externa. The serosa is the outermost tissue layer of those portions of the alimentary canal that are suspended in the peritoneal cavity by mesentery. It is the visceral peritoneum of gross anatomy.