A vesicle is a compartment made from a fatty membrane that separates the inside environment from the outside. A multivesicular vesicle is a large vesicle containing many smaller vesicles, much like a cell which can contain many internal compartment. When the inner compartment of the large vesicle has a higher concentrations of molecules ( for example sugar in our video) than the outside, outside water molecules rush in until the large vesicle bursts releasing some of the small vesicles. Once the membrane tension has been released, the large vesicle reseals. However, as you can see in the video, resealing is not always a clean process. Some vesicles will spontaneously form "hairy " appendages on their surfaces like the second example in the video. Understanding, what conditions produce these tufts of membrane could provide deeper insights into the flexible shape transformations of living cells.
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