GENERAL HISTOLOGY

Detailed explanation-1: -Mollusks are invertebrates such as snails, scallops, and squids. Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot.

Detailed explanation-2: -Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs. In many species, the mantle produces a hard shell. Not all molluscs produce a shell.

Detailed explanation-3: -Bivalve mollusks (e.g., clams, oysters, mussels, scallops) have an external covering that is a two-part hinged shell that contains a soft-bodied invertebrate.

Detailed explanation-4: -Unlike other mollusks, the shell of squids is not external but rather is internal (and much reduced in size). A tough, muscularized mantle completely surrounds the animal (Figure 4). 1. The head of the squid should have eight arms of about the same size, known as grasping arms.

Detailed explanation-5: -The shells you find littered along the beach are actually the ‘skeletons’ of invertebrate animals called mollusks. Unlike the internal skeleton of humans, mollusks actually have an external skeleton.