Produce a written assignment showing an understanding of the four main tissue types (epithelial, muscle, connective and nervous) and what they do in the heart and the intestine.

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Unit 5- Anatomy and physiology

Task 1


P2- Outline the structure of the main tissues of the body.


Produce a written assignment showing an understanding of the four main tissue types (epithelial, muscle, connective and nervous) and what they do in
the heart and the intestine.

 
Tissues are groups of cells with a common structure and function. There are four main tissues in the body – epithelium, muscle, connective tissue and
nervous tissue.

Epithelial tissue-
Epithelial tissue covers external surfaces and internal cavities and organs. Glands are also composed of epithelial tissue. It is made up of cells closely packed and ranged in one or more layers; compound epithelia is made up of several layers of cells and Simple epithelia is a single layer of cells. Simple epithelial includes four different types; squamous, cuboidal, ciliated and columnar. Epithelial tissue, regardless of the type, is usually separated from the underlying tissue by a thin sheet of connective tissue; basement membrane. The basement membrane provides structural support for the epithelium and also binds it to neighbouring structures. As a group, epithelial tissues perform a variety of functions, including protection, absorption, excretion, secretion and lubrication. It is surface tissue so capacity for growth and repair is greater than any other tissue.
 
In the Intestines- 
The apical surface of epithelial cells may have tiny projections called microvilli. These function to increase surface area. For example, microvilli on intestinal cells increase the surface area available for absorption. Absorption is an important function of epithelial tissue within the intestines. The surface of the small intestine is lined with simple columnar epithelium. This type of epithelium appears as a single layer of tall, column-shaped cells with oblong nuclei. The primary function of this type of epithelium is absorption of nutrients, secretion of digestive juices as well as secretion of mucus by goblet cells. The surface area of the small intestine is increased by outward finger-like extension sand inward indentations, as villi and crypts. Both of these structures are lined with simple columnar epithelium.

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In the heart- 
The epithelial tissue protects the heart from rubbing and damaging the lobes in the heart against the lungs; it provides an extra barrier for security and saves the heart from injuries. Epithelial tissues line all the ducts and glands within the heart and protect it with an exterior membrane.

Connective tissue-
Connective tissues function primarily to support the body and to bind or connect together all types of tissue. Unlike epithelial tissue, connective tissue is characterised by the large amounts of intercellular substance (also called ground substance or the matrix) that it contains. Connective tissue is relatively few cells which ...

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This is a very good essay. It discusses tissue types and is generally correct and detailed throughout. There are a few areas that could be corrected through a little more research. It would be greatly enhanced by including some diagrams. ****