What is the function of ampulla on a star fish?

1. Locomotion: Ampullae are small, fluid-filled sacs located at the base of each tube foot in a starfish. They work in conjunction with the tube feet to enable the starfish to move. When the ampullae contract, they force water into the tube feet, causing them to extend. The starfish can then attach the suckers on the end of the tube feet to a surface and pull itself forward.

2. Feeding: Starfish use their tube feet and ampullae to capture and manipulate prey. When a starfish encounters a potential food source, it extends its tube feet and uses the suckers on the end to grab the prey. The ampullae then contract, pulling the prey towards the starfish's mouth.

3. Respiration: Ampullae are also involved in the respiration of starfish. The water that is pumped through the tube feet and ampullae contains dissolved oxygen, which the starfish absorbs. This oxygen is used for cellular respiration, which provides energy for the starfish's various activities.

4. Sensory Functions: Ampullae may also have some sensory functions. They contain sensory cells that can detect changes in water pressure and chemical composition, which can help the starfish respond to its environment.