Answer is Nitrogen...............
Answer:
The general structure of the endoplasmic reticulum is a network of membranes called cisterns, these bag-like structures are stretched together by the cytoskeleton. The phospholipid membrane surrounds the cystic space (or lumen), which is an extension of the nuclear space but is separated from the cytosol
Can you re state the question it’s confusing
I'm pretty sure the blank is underneath. Hope this helped. Have a great day! :D