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.
Basic external anatomy of a lamprey. Adults physically resemble eels, in that they have no scales, and can range from 13 to 100 cm (5 to 40 inches) long. Lacking paired fins, adult lampreys have large eyes, one nostril on the top of the head, and seven gill pores on each side of the head.n folklore lampreys are called nine-eyed eels. The name is derived from the seven external gill slits which, along with one nostril and one eye, line each side of a lamprey's head section. Likewise, the German word for lamprey is Neunauge, which means nine-eye.