A tissue is a group of cells that are similar in structure and perform a specific function. There are two types of tissues, i.e., Plant tissue and animal tissue. Plant tissues are further divided into two types, meristematic and permanent tissues. On the basis of location of the meristematic tissue, it is divided into three types, i.e., apical, intercalary and lateral meristem. Permanent tissues are classified as simple and complex tissues. There are three types of simple tissues: Parenchyma, collenchyma and sclerenchyma. There are two types of complex tissues, xylem and phloem. Xylem tissue is made of four kinds of cellular components namely tracheids, vessels, xylem parenchyma and xylem fibres. While, phloem tissue consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres. Animal tissues are classified as epithelial, connective, muscular and nervous tissue. On the basis of shape and function, epithelial tissue is classified as squamous, cuboidal, columnar, ciliated and glandular. The different types of connective tissues in our body are: areolar tissue, adipose tissue, bone, tendon, ligament, cartilage and blood. Muscular tissues are classified as striated, unstriated and cardiac. Nervous tissue is made of neurons that receive and conduct impulses.

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