What is a endoplasmic perticulum?

Answer 1

I think you are thinking of endoplasmic reticulum. Noun: membrane network within the cytoplasm of cells involved in the synthesis, modification, and transport of cellular materials.

Answer 2

The endoplasmic reticulum (ER) is a network of membranous tubules and sacs found in eukaryotic cells. It plays a key role in protein and lipid synthesis, as well as in the transport of these molecules within the cell. The ER can be further divided into smooth ER, which lacks ribosomes and is involved in lipid metabolism, and rough ER, which has ribosomes attached to its surface and is involved in protein synthesis.