Many other common diseases are caused by autoimmunity such as juvenile diabetes and low thyroid disease. It has been recently discovered that some persons who suffer with hives or angioedema also have an autoimmune disease. In these cases, autoantibodies have been formed that bind to the Fc-receptor on mast cells.
Lesson Summary. Chitin is a primary component in the exoskeletons of arthropods and crustaceans and is also found in the cell walls of fungi. It's a polysaccharide, and it's excreted by the epidermal cells in arthropods. But, it can't grow with the animal, so shedding becomes necessary.
(2) A polysaccharide which makes up the cell walls of fungi and exoskeleton of insects. Supplement. Examples of organisms with chitin are the arthropods in their exoskeletons, some arachnids in their hard outer covering, molluscs in their radula, cephalopods in their beaks, and some fungi species in their cell walls.Chitin resembles keratin (protein component in human hair and nails) in structural function.2) A polysaccharide which makes up the cell walls of fungi and exoskeleton of insects. Supplement. Examples of organisms with chitin are the arthropods in their exoskeletons, some arachnids in their hard outer covering, molluscs in their radula, cephalopods in their beaks, and some fungi species in their cell walls.