Economic activity produces consumer goods or provides services. Examples of primary economic activities include these examples: Commercial fishing; Farming - growing crops (arable farming) or animal husbandry (pastoral farming) Quarrying - extracting sand or gravel; Mining of minerals, oil and gas extraction, and production
Meninges. A series of membranous layers of connective tissue that protect the central nervous system (brain and spinal cord). Damage or infection to the meninges, such as in meningitis, can cause serious neurological damage and even death.Mentioned in: Campylobacteriosis, Enterovirus Infections, Shigellosis, West Nile Virus. series of membranous layers of connective tissue that protect the central nervous system (brain and spinal cord). Damage or infection to the meninges, such as in meningitis, can cause serious neurological damage and even death. Mentioned in: Campylobacteriosis, Enterovirus Infections, Shigellosis, West Nile Virus.
The submucosa is a layer of dense connective tissue. It contains blood and lymph vessels, and is infiltrated by lymphoid cells, mast cells and macrophages. The muscle layer (muscularis) is composed of smooth muscle fibers. The fibers are oriented in three main directions. The external layer is longitudinal, the middle layer is circular and the internal layer is oblique. The serosa , a thin layer of serous membrane, is the outermost layer of stomach wall.