Describe the function and components of the mucosal barrier of the stomach. Protects the stomach from autodigestion Components Thick coating of bicarbonate-rich mucus Tight junctions of the epithelial cells Plasma membrane of gastric glands are impermeable to HCl.
World Range & Habitat. Sea lampreys, Petromyzon marinus, are found only in the Mediterranean and North Atlantic, in the coastal seas off the North East USA, Nova Scotia, southern Greenland, the UK, Ireland and Scandinavia. They are also found in the Great Lakes and enters inland freshwater rivers and streams to breed.
The hagfish are displayed with the fish as they used to be classified with the lampreys and extinct ostracoderms in the superclass Agnatha, a term no longer used. All hagfish are marine, feeding on invertebrates but also scavenging on dead and dying fish.here are two groups of living jawless, elongate eel-like animals lacking paired fins: hagfish and lampreys. These animals are the only living representatives of ancient creatures that gave rise to the fish and eventually humans.