Answer:
The tube feet have a bulb-like structure at one end called the ampulla and Podium at the other end, which aids in the starfish's ability to attach to surfaces, as well as hold its prey.
Step-by-step explanation:
Echinoderms i.e Starfishes have hundreds of tiny projections known as tube feet on the underside of their body. They allow the starfish to move and hunt for food in the ocean.Tube feets are hollow thin walled structures that end in being suction cups and helps in
1.Locomotion
2.Respiration
3.Feeding
Starfishes use tube feet on their arms to help them move, and each tube foot contains what is called an ampulla. These ampulla move water into the tube feet to help stretch them. They operate through water vascular system.
Water vascular system provides the vascular pressure which allows the tube feet to operate. Water enters the system through a sieve-like structure on the upper surface of the animal, called the madreporite. From here it moves into the ring canals and into radial canals and then into the tube feet, which allows them to move.Water also leaves through madreporite.
Through podium the starfish attaches to the surfaces of its prey, such as a snail, clam or oyster, and uses tube feet to capture it, hold it close to its mouth. Once the prey is close and secure, the starfish pushes its stomach out through its mouth to digest the prey.