GENERAL HISTOLOGY

Detailed explanation-1: -The cardiac stomach digests the tissue of captured prey while it is still outside the body. The internal pyloric stomach further digests food and processes nutrients throughout the body.

Detailed explanation-2: -Echinoderms feed on a variety of marine life in a variety of ways. Filter feeders, like brittle stars, absorb nutrients in marine water. Suspension feeders use their arms to capture floating food particles. Grazers, like sea urchins, feed on both plants and animals, making them omnivores.

Detailed explanation-3: -A starfish feeds by first extending its stomach out of its mouth and over the digestible parts of its prey, such as mussels and clams. The prey tissue is partially digested externally before the soup-like “chowder” produced is drawn back into its 10 digestive glands.

Detailed explanation-4: -Sea cucumbers (Holothuroidea) eject parts of the gut in order to scare and defend against potential predators such as crabs and fish. The organs are regenerated in a few days by cells in the interior of the sea cucumber.

Detailed explanation-5: -Echinoderms have a simple digestive system with a mouth, stomachs, intestineand anus. In many, the mouth is on the underside and the anus on the top surface of the animal. Sea stars can push their stomachs outside of their body and insert it into its prey allowint them to digest the food externally.