👉 A fibrillation is a type of fiber that is produced by the process of cell division. It occurs when cells divide repeatedly, resulting in the formation of new cells with different genetic material and characteristics. Fibrillations are often found in the human body during embryonic development, where they play a crucial role in the formation of blood vessels and other tissues. In more advanced stages of development, fibrillations can be observed in various organs and systems throughout the body, including the heart, lungs,