Forums Science Assignment Help Biology What are the 4 types of tissues and their functions?

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    Evolutionarily there also occurred specialization of tissue types. What are the 4 types of tissues and their functions?



    The Four types of tissues and their function are:

    1. Epithelial tissue
    2. Connective Tissue
    3. Muscle tissue
    4. Nervous tissue

    1. Epithelial tissue covers the body parts and its surfaces either interacts with outside environment on inner fluid. Compactly packed these are divided into two types and these are:

    i. Simple Epithelium – This is found in the lining of the body cavity, ducts and tubes.

    ii. Compound Epithelium is made up of more than one layer and its function is in body protection such as Skin. Modification in structure further categorize simple epithelium in the following types and these are:

    a) Squamous Epithelium – This comprises of a single layer of flattened cells and the boundaries of these cells are irregular. Its function is mainly in diffusion and makes the boundary of alveoli.

    b) Cuboidal Epithelium – Being in the category of simple epithelium consist of single layer cells which are cube like and forms the lining of gland ducts, kidney nephrons. The Main function is these are involved in secretion and absorption.

    c) Columnar epithelium – It comprises single layer cells but is columnar like (tall and slender). As they bear microvilli their function is as understood in secretion and absorption.

    d) Transitional Epithelium – It Comprises of more than one layer of cells. Their main function is to prevent the chemical and mechanical stress.

    2. Connective tissues – The main function of connective tissue is to support and link the other tissue and organs of the body. These vary in complexity in structure and function from soft to specialized ones. Categorized into the following types:

    i. Loose connective tissue – They are loosely arranged and in a semi fluid ground substance. An example of loose connective tissue is areolar tissue, adipose tissue both underlying skin.

    ii. Dense connective tissue – Compactly arranged fibers and fibroblasts. On the basis of pattern shown by the fibers further classified into Dense regular with presence of collagen fibers in rows between parallel bundles such as Tendons and ligaments and also dense Irregular with the presence of fibroblasts and fibers differently like skin

    iii. Specialized connective tissue – Blood and Bones come in this category.

    3. Muscle Tissue: These consist of Myofibrils that are the fibers which form each muscle. There are three types of muscle and these are: –

    i. Skeletal muscle – These are found attached with skeletal bones bundling in a parallel fashion. These are nucleated and have striations. E.g.: – Muscles of biceps.

    ii. Smooth muscle – These are the fusiform type that means tapering at both the ends, nucleated and are not striated. These are present in the internal organs of stomach and intestines.

    4. Neural tissue: – Cells constituting the neurological system are the neuroglial cells. The functional unit of the neural system is neuron. Electrical signals travel through the plasma membrane when stimulation occurs in the neurons.

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