GENERAL HISTOLOGY

Detailed explanation-1: -Sea stars don’t have a circulatory system like we do. They have a water vascular system. This is a system of canals in which seawater, instead of blood, circulates throughout the sea star’s body.

Detailed explanation-2: -The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet.

Detailed explanation-3: -The echinoderm water vascular system is a circulatory system based on running external water through the organism.

Detailed explanation-4: -The fluid in echinoderms is carried through a network of tubes called the haemal system. They have an open circulatory system, which means that fluid travels freely throughout the body.