Top 5 Reasons of importance: 1. The movement of flagella causes water movement that is necessary for respiration and circulation of in sponges and coelenterates
2. Most motile bacteria move by means of flagella
3. The Flagella is significant in the initiation of body defense. The protein flagellin in bacterial flagella, binds to receptors on a variety of defense cells and triggers innate immune defenses such as inflammation, fever, and phagocytosis
4. Initiation of Adaptive Immunity:Proteins tied to flagella behave as antigens and initiate adaptive immunity