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P2: Outline the four main tissue types such as Epithelial, connective, muscle, nervous.

Tissues are groups of cells, which are placed together to achieve a common function. There are four main types of tissue: Epithelial, connective, muscle and nervous. Most of these tissues are found in our bodies, however the epithelial tissue is covered all over the surfaces of the body.

Epithelial tissue
This tissue covers the whole surface of the body and is specialised to form the covering or lining of all internal and external body surfaces. The bottom layers of the cells are attached to the basement membrane for support and connection. Endothelium is an epithelial tissue that occurs on surfaces on the interior of the body. There are nerve supplies to Epithelia; however, they are supplied with oxygen and nutrients from deeper tissues by diffusion. Simple epithelia cells are very flat, with each nucleus with a small lump in the middle. They fit closely and can’t offer much protection and their function is to allow materials to pass through diffusion. This is usually found in lung alveoli and blood capillaries. Compound epithelia main function is to protect deeper structures and multiple layers of cells that obstruct the passage of materials.

Connective tissue
Connective tissues lie beneath the epithelial tissues; this connects different parts of the internal structure. They are in all parts of the body. It is responsible for providing structural support for the tissues and organs of the body. There are many functions of these tissues, which include: They transport materials, give support and strengthen and protect. There are many examples of connective tissues, which include: blood, cartilage and adipose tissue. Blood includes pink coloured plasma, in which various types of blood are carried. The plasma is mostly water and carries several substances such as

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