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.
Many people who fish in the Great Lakes region are aware of the sea lamprey that invaded the Great Lakes from the Atlantic Ocean in the 1930s and 1940s. It had a devastating effect on the Great Lakes fishery nearly bringing lake trout to extinction.