GENERAL HISTOLOGY

Detailed explanation-1: -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-2: -Stone Canal: a tube connecting the sea star’s madreporite to its ring canal that’s the second part of the sea star’s water vascular system.

Detailed explanation-3: -Complete answer: The stone canal is a part of the structure of echinoderms. It is a part of the vascular system. In sea stars, water enters the water vascular system through a sieve-like structure on the upper surface of the animal. This sieve-like structure is called the madreporite.

Detailed explanation-4: -It helps to regulate liquid fluid, which the water-filled canal and porous feet’s wall allows the fluid to flow easily. The water vascular system helps the echinoderms to survive during their adaption. The all-essential function for surviving is facilitated by the Water vascular system.