Question

What is the plasma found inside endoplasmic reticulum called?

Answer 1

er has luminal compartment 

Answer 2

$\huge {\mathcal {\underline {\underline {\purple {AnSwEr}}}}}$

The endoplasmic reticulum is found in most eukaryotic cells and forms an interconnected network of flattened, membrane-enclosed sacs known as cisternae (in the RER), and tubular structures in the SER. The membranes of the ER are continuous with the outer nuclear membrane.