Question

Как пастроена пишеварительная система ланцетника​

Answer 1

Ответ:

Пищеварительная система ланцетника несовершенна, так как в ней нет желудка. Вместо него у животных есть так называемый печёночный вырост. В кишечнике и в печёночном выросте пища переваривается, а её непереваренные остатки выводятся через анальное отверстие

Answer 2

Structure of the Lancelet's Digestive System

The lancelet, also known as amphioxus, has a relatively simple digestive system compared to other vertebrates. Here's a breakdown of its structure:

1. Pharynx and Buccal Diverticulum: - The lancelet's digestive system starts with the pharynx, which is a muscular tube used for both feeding and respiration. The pharynx is connected to the buccal diverticulum, which aids in filter-feeding. - *Source:

2. Endostyle: - The endostyle is a ciliated groove located on the ventral side of the pharynx. It plays a role in filter-feeding and the production of mucus for trapping food particles. - *Source:

3. Esophagus: - From the pharynx, the food travels through the esophagus, a tube that connects the pharynx to the intestine. - *Source:

4. Intestine: - The intestine is the site of digestion and absorption of nutrients. It is a straight tube that runs through the body cavity. - *Source:

5. Anus: - The lancelet has a simple anus through which undigested food is expelled from the body. - *Source:

Conclusion

The lancelet's digestive system is adapted for filter-feeding and is relatively simple compared to more complex vertebrates. It efficiently processes food and absorbs nutrients through its streamlined structure.