GENERAL HISTOLOGY

Detailed explanation-1: -If you pick up or bother a sea cucumber, it will squirt water from its rear hole, and it may even eject its innards. This is a defense mechanism that sea cucumbers use to protect themselves from predators.

Detailed explanation-2: -These squishy invertebrates are echinoderms, making them distant relatives to starfish and urchins. Unlike starfish or sea urchins, the bodies of sea cucumbers are covered with soft, leathery skin instead of hard spines.

Detailed explanation-3: -In most echinoderms there is a relatively straightforward digestive process with food entering the mouth and vacating via the anus. Brittle stars and certain groups of sea stars lack an anus, however, and vent food via the mouth once their digestion is complete.

Detailed explanation-4: -It can grow to a length of 50 cm and a width of 5 cm, and when drained of fluids can weigh up to 500 grams. It has a soft, cylindrical body, with red-brown to yellowish leathery skin. It has an endoskeleton just below the skin. The mouth and anus are on opposite ends of the body.