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.
Brook lampreys are an entirely freshwater species, and unlike other British lamprey species, do not feed on as adults. They are the smaller of the British lamprey species, reaching a length of 15-19 cm. Despite being freshwater-resident, brook lamprey do, however, undergo limited spawning migrations.ea lamprey. Sea lamprey are the largest of the three species, reaching a size of approximately one metre in length. After spending 18-24 months feeding at sea, adult sea lampreys migrate into rivers during the spring and early summer.