Here’s actually what some of these things look like in the electron microscope to see whether we can either believe or fully discredit the imaginations of the artists. Here’s the rough endoplasmic reticulum I showed you in schematic form before. And you can see why it’s called rough. All these black dots are ribosomes attached on the outside. Here’s the Golgi apparatus. You see these vesicles indicated here. And a vesicle, just to use a new word, is simply a membranous bag.