This is also heterogeneous, i.e. a composite of carbon-poor iron and cementite. Going to very fast cooling (quenching) will result in a single-phase (not composite) material called martensite. Here the carbon doesn't have time to exit the iron, and this martensite phase is very hard, but also normally too brittle.
Epithelial tissue - to cover the inner and outer surfaces of the stomach The stomach is one of the organs that form the digestive system. The stomach contains various tissues, and each tissue is made of a particular type of cell. In order of increasing size and complexity: cells â tissues â organ (the stomach) â organ system (the digestive system)
The stomach wall is not composed of protein, so it's not affected by proteolytic enzymes. B) The digestive enzymes of the stomach are not strong enough to digest the stomach wall. The lining of the stomach wall has a protective layer of epithelial cells. D) The stomach wall is protected by large amounts of mucus.