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.
â¢ ALIMENTARY CANAL (noun). The noun ALIMENTARY CANAL has 1 sense: 1. tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination. Familiarity information: ALIMENTARY CANAL used as a noun is very rare.he noun ALIMENTARY CANAL has 1 sense: 1. tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination. Familiarity information: ALIMENTARY CANAL used as a noun is very rare.