P2 Outline the Structure of the Main Tissues of the Body

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P2 There are two different types of epithelial tissue these are simple and compound. Simple Epithelium- this type of epithelium tissue is from an animal consisting of one of more layers of closely packed cells. The cells can vary in structure depending on their function which may be protective, secretory or absorptive. This epithelium tissue covers external and internal surfaces of the body. Compound Epithelium – this type of epithelial tissue is made to withstand wear and tear. It is composed by several layers of cells which is the reason for the name of the cell. The epithelium may or may not be keratinised which contains a tough, resistant protein called keratin for example skin or unkeratinised which is what the lining of your mouth is made up of. Unstriated muscle – this is the type of muscle which still contains protein filaments but they do not lie in an orderly pattern as with striated muscle. In this type of muscle the fibres are spindle shaped and generally have a central nucleus, and dove-tail into each other. This muscle forms sheets and control is not under conscious thought. The stimulations for this muscle come from the autonomic nervous system, hence the alternative name which is involuntary muscle. It can be found in organs such as intestines, uterus and stomach. It is not attached to the skeleton. Cardiac muscle – this is only found in the heart and the junction where the major vessels enter or leave the heart. This muscle appears to have similar properties to both skeletal and smooth muscle in that it contains fibres which are striped but unlike striped muscle there are branches which interconnect also known as intercalculated discs. As we need to keep alive, cardiac muscle is an involuntary muscle. Nervous tissue – this is only found in the nervous system and consists of two different tls which transmit nerve impulses throughout the body
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