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)
1) Epithelial Tissue. Epithelial tissue forms the covering or lining of free body surfaces, both internal and external. For example, the outer layer of the skin is formed from epithelial tissue as are the inner linings of the digestive tract and blood vessels.As a group, epithelial tissues perform a variety of functions, including protection, absorption, excretion, secretion and lubrication.I ANIMAL TISSUES. In animals, organs are composed of varying combinations of four basic tissue types -- epithelial tissue, connective tissue, muscle tissue and nervous tissue. Each of these tissues has distinctive structural features and specific functions which are again combined to produce functioning organs.