What is the space between the internal organs and the skin-muscular sac filled with?

The space between the skin-muscular sac and the internal organs is filled with parenchyma originating from the 3rd embryo sac – the mesoderm. Typical for flatworms. The parenchyma has a variety of functions:
1. Body support.
2. Participates in complex metabolic processes.
3. Supply of nutrients.
4. Can form other types of cells in the body of worms.



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