how can you say that enzymes secrated by the gastric gland work in a different medium than the enzymes secreted by pancreas?
Answers
Explanation:
There are three types of gastric glands, distinguished from one another by location and type of secretion. The cardiac gastric glands are located at the very beginning of the stomach; the intermediate, or true, gastric glands in the central stomach areas; and the pyloric glands in the terminal stomach portion. Both the cardiac and pyloric glands secrete mucus, which coats the stomach and protects it from self-digestion by helping to dilute acids and enzymes.
The intermediate gastric glands produce most of the digestive substances secreted by the stomach. These glands are narrow tubules composed of three major cell types: zymogenic, parietal, and mucous neck cells. At the base of the gland are the zymogenic (chief) cells, which are thought to produce the enzymes pepsin and rennin. (Pepsin digests proteins, and rennin curdles milk.) Parietal, or oxyntic, cells occur throughout the length of the gland and are responsible for the production of hydrochloric acid, which is necessary to activate the other enzymes. The purpose of mucous neck cells is to secrete mucus.
Epithelial mucous surface cells (A) extend into the gastric pits (B) of the mucosal lining in the lumen of the stomach (C, gastric glands; D, muscularis mucosa of the stomach).
Epithelial mucous surface cells (A) extend into the gastric pits (B) of the mucosal lining in the lumen of the stomach (C, gastric glands; D, muscularis mucosa of the stomach).
Uniformed Services University of the Health Sciences (USUHS)
There is usually a small, constant production of gastric juices, but their secretion can be stimulated by numerous means. Tasting, smelling, or thinking of food tends to increase enzyme secretions. The production of gastric juices is limited while a person is asleep, but production resumes upon awakening. Consumed food provides additional stimulation necessary for mucus secretion. Some foods also contain chemicals that activate enzyme production. Psychological states of fear, sadness, or withdrawal may reduce gastric secretion.
Get a Britannica Premium subscription and gain access to exclusive content.
Subscribe Now
This article was most recently revised and updated by Kara Rogers, Senior Editor.
Learn More in these related Britannica articles:
human digestive system
human digestive system: Gastric mucosa
…and the formation of a protective layer over the lining epithelium of the stomach cavity. This protective...…
human stomach
stomach
Stomach, saclike expansion of the digestive system, between the esophagus and the small...…
newsletter icon
HISTORY AT YOUR FINGERTIPS
Sign up here to see what happened On This Day, every day in your inbox!
Email address
Email address
By signing up, you agree to our Privacy Notice.
Hello mate ,
The gastric gland secrets gastric juices and protective mucus and the pancreas secrets pancreatic juice. Gastric gland is present in stomach. It inhabits the infectious agents from reaching our intestine whereas pancreatic juice break down sugars, fats, and starches. Pancreas also helps the digestive system by making hormones and these are the chemical messengers that travel through our blood.
Hope this helps you (◕ᴗ◕✿)
Good evening !!