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This essay will look at different types of human tissues and will describe brief characteristics of four main types of tissue

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´╗┐Human tissues This essay will look at different types of human tissues and will describe brief characteristics of four main types of tissue (figure 1.1). Furthermore it will investigate two different types of tissues 1 and 2 from the diagrams in more depth and will look at where each tissue is found in the body. Also it will discuss their roles and relate the structure of each tissue to its function. McGuiness (2002) defines tissue as a group of cells that act together to perform a specific function. However, Hall (2005) state that tissue is a group of similar cells that form the main fabric of human body. From this can be noted that some tissues are soft, like the inner layers of the skin, others are hard, such as bone and fingernails. Different tissues combine to form more complex structures called organs. An organ usually has a specific function in the organism, for example, to detect light, to absorb food or to produce a hormone (Boyle and Senior, 2008). There are four basic or primary types of tissues (Figure 1.1). ...read more.


Nervous tissue forms a network of nerve cells in the body and also in the brain and spinal cord (Hall, 2005). Also it is the major tissue for communication and control within the body?s internal environment. The nervous tissue (figure 1.1 D) largely does its communicating by means of neurons, i.e. the nerve cells. For example, a function of neurons within the nervous tissue is to inform the brain when the body has been damaged, usually resulting in the sensation of pain (Layman, 2003). Diagram 1 is Pseudostartified columnar ciliated epithelial tissue. Diagram 2 is Compact bone (connective) tissue. In diagram 1 is a section view of pseudostratified columnar epithelium of trachea. In diagram 2 is sectional view of an osteon (Harvesian system) of femur (thigh bone). Diagram 1 Diagram 2 Pseudostratified columnar ciliated epithelium As the name implies, pseudostratified epithelium (diagram 1) is not a true stratified tissue. Cells are columnar but tall and thin. All cells are attached to basement membrane, but not all reach the apical surface (Tortora and Garbowski, 2000). From this can be noted, that the unique appearance of pseudostratified epithelia occurs because of the tall, thin cell intertwine. ...read more.


The caniculi connect lacunae with one another and with the central canal. For example, blood-borne nutrients and oxygen can diffuse to and from the bone cells from the central canal through these canaliculi. Osteons in compact bone tissue are aligned in the same direction along lines of stress. In the shaft, for example, they are parallel to the long axis of the bone. As a result, the shaft of a long bone resists bending or fracturing even when considerable force is applied from either end. The lines of stress in the bone are not static. For example, when person undertakes weight training, lines of stress change in response to repeated strenuous physical activity. Thus, the organisation of osteons changes over time in response to the physical demands placed on the skeleton. Compact bone tissue provides protection and support. For example resists the stresses produced by weight and movement (Tortora and Garbowski, 2000). The aforementioned evidence shows that human body is compiled of different cells that work together in a group with specialised functions, which forms different kinds of tissues, for example, epithelial tissue that lines the cavities and surfaces of structures throughout the body, furthermore, different tissues form organs. ...read more.

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