Pepsinogen I is secreted by chief cells, and pepsinogen II is secreted by pyloric glands. The secretion of pepsinogen is stimulated by vagal stimulation, gastrin, and histamine. Pepsinogen I is mainly found in the body of the stomach, where most acid is secreted. Pepsin is a proteolytic enzyme, whereas pepsinogen is a proenzyme. â¢ Pepsin is the active form of pepsinogen while pepsinogen is the inactive precursor of pepsin. â¢ Unlike the pepsin, pepsinogen is secreted by chief cells and pyloric glands.
A reefer ship is a refrigerated cargo ship; a type of ship typically used to transport perishable commodities which require temperature-controlled transportation, such as fruit, meat, fish, vegetables, dairy products and other foods.
Icebreaker ships are a special class of ships that break even thickest of the ice and make some of the most inhospitable paths accessible to the world. These ships have a specialized design that allows them to carry out this particular task. The idea of an ice breaker ship has been around for a very long time. In times as long ago as 1800, an ice breaker ship was known to work. Of course, they were more of boats then. Even today, their basic design remains the same, although the modernization has certainly made them much more efficient.