AP BIOLOGY

Detailed explanation-1: -Echinoderms have a characteristic coelomic water vascular system. This system is controlled hydraulically. It comprises a circumoral ring covering the esophagus which connects radial canals. The radial canals lead to an ambulacrum.

Detailed explanation-2: -Water vascular system is a unique characteristic of echinoderms. It helps in locomotion, the capture of food and respiration.

Detailed explanation-3: -The components of the water vascular system of echinoderms. Water enters the system through the madreporite, flows through the stone canal, and enters the ring canal. A number of bulbous structures, called polian vesicles, that branch off of the ring canal serve as reservoirs to maintain extra water stores.

Detailed explanation-4: -Water vascular system is a characteristic feature of the phylum Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite. The water vascular system helps in locomotion, food capturing, and respiration.