In fact, cholesterol can be transformed into the different types of steroids inside the smooth endoplasmic reticulum. And finally, our smooth endoplasmic reticulum can also detoxify drugs. It can undergo different types of oxidation reactions in which it detoxifies toxin and drugs such as, for example, alcohol. So one might imagine that the cells in our liver contain very large smooth Er, and that's because in the liver, one of the main roles of our liver is to basically detoxify the different drugs and toxins that we ingest into our body. Now, finally, let's move on to our Golgi apparatus. So what exactly is the Golgi apparatus?