Each of these substances is produced by exocrine or endocrine cells found in the mucosa. 1  The main exocrine product of the stomach is gastric juice â a mixture of mucus, hydrochloric acid, and digestive enzymes. 2  Gastric juice is mixed with food in the stomach to promote digestion.
Industry is the production of goods or related services within an economy. The major source of revenue of a group or company is the indicator of its relevant industry. When a large group has multiple sources of revenue generation, it is considered to be working in different industries.
A category of industries, made up of companies which deal with products or services that are not necessities. The degree of spending and amount of consumption of these products and services varies depending upon the individual. These industries include automobiles, high-end clothing, restaurants, hotels, and luxury goods.