What are the digestive organs of invertebrates? What invertebrate devices do you have for grabbing food?

In gastrointestinal, intracellular digestion begins to be replaced by intracavitary. Food is initially exposed to enzymes and ground in the cavity, and then captured by endoderm cells, where it is digested in digestive vacuoles. In flatworms, the digestive tube is also blindly soaked and consists of two sections – the anterior ectoderm, represented by a well-developed pharynx, and the middle (intestine), developing from the endoderm. Digestion intracavitary and intracellular. In roundworms, the third section of the digestive tract appears – the posterior. It is formed by poking the ectoderm at the posterior end of the body, connects to the cavity of the middle intestine and ends at the posterior end of the body with an anus. With the advent of the hind gut, food moves in only one direction, which ensures its more complete assimilation. Digestion becomes only intracavitary. The anterior and posterior intestines, having an ectodermal origin, are lined with cuticles. In annelid worms, muscle elements that provide peristalsis appear in the wall of the intestine, and a network of blood vessels develops. Arthropods undergo further differentiation of the intestinal tube and at the same time there are devices for grinding food (jaw) and glands that secrete digestive enzymes.

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