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.
During that time, sea lamprey will become mature and it will return back to fresh water for spawning. Spawning takes place in the spring. Sea lamprey can deposit as much as 100 000 eggs in the stony nests. Sea lampreys will die immediately after spawning. A lot of eggs deposited by sea lamprey serve as food for other fish in the water.