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P2: Describe the structure of the tissues of the body and their role in the functioning of two named body systems.

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Introduction

P2: Describe the structure of the tissues of the body and their role in the functioning of two named body systems. Epithelial tissue: Simple Epithelial tissue is one of the four major tissue types in the body, acting as an interface between the body and the rest of the world. Skin is composed of epithelial tissue which lines the body cavities and major organs. There are several different types of epithelial tissue, which form to fulfil specific needs and functions. This tissue, known collectively as the epithelium, can filter, absorb, and diffuse various substances, and it is also involved in sensory perception and bodily secretions. According to Marieb (2000) 'covering and lining epithelium covers all three body surfaces and contains versatile cells. One type forms the outer layer of skin while others dip into the body to line it cavities.' Cuboidal Cuboidal epithelium is cube-shaped with spherical nuclei in the centre that line ducts and tubes and allows materials to pass through. They are found in secretive or absorptive tissue like the exocrine gland, the lining of the kidney tubules and in the ducts of the glands. They also constitute the germinal epithelium, which produces the egg cells in the female ovary and the sperm cells in the male testes Columnar Columnar epithelium forms the lining of the stomach and intestines. Their nuclei are elongated and are usually located near the base of the cells with slightly oval nuclei. ...read more.

Middle

When parts of the body become inflamed, the connective tissue areolar soaks up the excess fluid and the part then swells up, this is a condition called edema. Various types of phagocytes are found in this tissue, they pick up and destroy bacteria , dead cells and other derbis. Adipose: Adipose is the name given for fatty and it is made up of a variation of areolar tissues of which adipose cells have doubled several times in order to obscure other cells and fibres. Once the adipose cell has matured adipose cells are filled so much fat that the cell is pushed to one side. Adipose is usually found under the skin and in organs like the heart and the kidneys. Adipose is also found in external temperature, it also helps protect the body against energy and it also stores energy. Muscle: Muscle is a specialized tissue that can contract. Muscle tissue contains the specialized proteins actin and myosin that slide past one another and allow movement. Examples of muscle tissue are contained in the muscles throughout your body. There are three types of muscles which are striated, non-striated and cardiac. Striated muscle: Striated muscle is attached to the bones of the skeleton or some and some facial muscles are attached to the skin. Striated muscle is found in skeletal muscle. Skeletal muscle is called striated muscle because striations are seen on it through a microscope. ...read more.

Conclusion

The lung is the organ where alveoli are mainly found. The pulmonary alveoli is where the exchange of gases in the blood takes place. The alveoli have an epithelial layer and plasma which is surrounded by matrix. The alveolar cells consist of three main types of alveolar cells these type of cells are known as type1, type 2 and type 3. Type one cells are what make the structure if the alveolar wall. Type 2 cells release surfactant in order to lower the surface tension of water and play a role in the increase of gas exchange. Type 3 cells eradicate unknown cells such as bacteria. The trachea which is also known as the wind pipe extends to bronchi from the larynx. Air travels through the trachea to get to the lungs. The lining of it consists of pseudostratified ciliated columnar epithelium cells that have mucosae goblet cells which are what produces mucus. The nasal cavity also known as the nasal fossa is a large space that is found above and behind the nose, the space is filled with air. The areas of the respiratory tract receive air that has been conditioned by the nasal cavity. Due to the big surface area provided by the conchae. The air that goes through the nasal cavity is either warm or cooled within one degree of the body's temperature. The air is then humidified. After this the dust and other particles are removed by the cilia, which are hairs that are found in the nostril. The cilia of the respiratory epithelium move the particulate matter towards the pharynx where it is swallowed. ...read more.

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Here's what a teacher thought of this essay

4 star(s)

This is a good essay that goes into a great deal of depth from a biological point of view. It discusses various forms of tissues and their structures.

However, it does not fully discuss how the tissues are related to function of organs. In places there is detail that is not required and the writer needs to choose information and relate it to the topic.

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Marked by teacher Sam Morran 07/06/2013

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