Unit 5- P2-P3- Produce a written assignment that shows an understanding of the main tissue types and the roles they play in two names organs. Tissues are groups of similar cells that perform a common function. There are four categories of tissues in the human body: epithelial, connective, nervous and muscle. First tissue is Epithelial tissue are linins of internal and external surfaces and body captives, includes ducts (tubes or channels) carrying secretions from glands. They may be compound by several layers, and some by simple layers which is called simple epithelial. The lowest or bottom layer of cells is attached to a basement membrane for support and connection. There are nerve supplies to epithelial cells, which supply’s it with oxygen and nutrients from deeper tissues by diffusion, their cells surface exposes to more friction for their capacity for growth and repair is greater than any other tissues and usually happens during sleep. Simple epithelia- may be squamous, cuboidal columnar or ciliated cells. Squamous epithelia cells are very flat with each nucleus forming a lump in the centre. The word ‘squamous’ means scaly referring to the flatness of the cell. The cells fit together and not all spread out, clearly because delicate thin cells cannot protect much so their chief function is to allow materials to pass through via diffusion and osmosis. Simple squamous is found in the walls of lung alveoli, blood capillaries, Bowman’s capsule of nephron. They often line ducts and tubes and can allow materials to pass through in a similar way. Squamous can also be found kidney tubules, sweat ducts, glands like the thyroid gland and breast tissue.
Connective tissue- generally tissue hold structures together, for example, loose connective tissue hold the outer layer of skin to the underlying muscle tissue. The tissue can also e found in fat layers, lymph nodes, or the red bone marrow. Fibrous connective tissue also hold body parts together, but its...
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