Basically, those proteins inside the phospholipid bilayer pump H ions into our vacuole and that increases the acidity and lowers our PH. And that gives these enzymes, the hydrolytic enzymes, the ability to break down the waste products stored inside vacuoles. Now, in animal cells, vacuoles are much smaller, they do not store as much water, and they basically function in aiding endocytotic and endo and exocytotic processes. Remember, endocytosis is the process by which the cell engulfs extracellular material and exocytosis is the process by which the animal cell spits out wasteful types of products. Now, let's move on to our Lysosomes. So what exactly is a Lysosome?