Question

Что общего у мешочков и плаценты, а чем они отличаются?​

Answer 1

Ответ:

Они отличаются от синцития тем, что многоядерность достигается за счет деления ядер в одной клетке. Ценоциты формируют сложную структуру, в которой плотно сидят развивающиеся эмбрионы. Другая необычная особенность плаценты этих мшанок заключается в том, что в ее формировании участвует мембранный мешок — орган, ответственный за выдвижение щупалец из «домика» зооида.

Answer 2

Similarities between Placenta and Sacs

Both placenta and sacs are related to reproduction and play important roles in the development and protection of embryos.

The placenta is an organ that develops in the uterus during pregnancy. It is responsible for providing oxygen and nutrients to the developing fetus, as well as removing waste products. The placenta also produces hormones that are necessary for maintaining pregnancy and supporting fetal growth.

Sacs, on the other hand, can refer to different structures depending on the context. In the context of reproduction, sacs can refer to the amniotic sac, which is a fluid-filled membrane that surrounds and protects the developing fetus. The amniotic sac helps cushion the fetus from external shocks and provides a stable environment for its growth. It also contains the amniotic fluid, which helps regulate temperature and allows the fetus to move and develop properly.

Differences between Placenta and Sacs

While both placenta and sacs are involved in reproduction, there are some key differences between them.

1. Function: The placenta primarily functions as an organ for nutrient and gas exchange between the mother and the fetus, as well as hormone production. On the other hand, sacs, specifically the amniotic sac, serve as a protective barrier for the fetus and provide a fluid-filled environment for its development.

2. Structure: The placenta is an organ that attaches to the uterine wall and is connected to the fetus through the umbilical cord. It consists of maternal and fetal tissues and has a rich blood supply. In contrast, the amniotic sac is a thin, transparent membrane that surrounds the fetus and contains the amniotic fluid.

3. Development: The placenta develops from the fertilized egg and forms as the pregnancy progresses. It is essential for the survival and growth of the fetus. The amniotic sac, on the other hand, forms early in pregnancy and is derived from the inner cell mass of the blastocyst.

4. Functionality: The placenta is a vital organ for the exchange of nutrients, oxygen, and waste products between the mother and the fetus. It also produces hormones that are necessary for maintaining pregnancy. The amniotic sac, on the other hand, provides protection and a stable environment for the fetus to develop.

In summary, while both placenta and sacs are involved in reproduction and play important roles in the development and protection of embryos, they have distinct functions and structures. The placenta is an organ responsible for nutrient and gas exchange, as well as hormone production, while sacs, specifically the amniotic sac, serve as a protective barrier and provide a fluid-filled environment for the fetus.