It synthesizes proteins that end up either being secreted from the cell or end up in the cell membrane of our cell. So basically, we see that the nuclear envelope and the membrane of our Er are jointed. They're connected in these regions. And that's exactly why once our nucleolus synthesizes those incomplete ribosomes, those ribosomes can then be placed inside this Er to basically embed the ribosomes inside the membrane of the Er. And then those ribosomes can synthesize our proteins. Now, what about this section, the smooth Er shown by region five.