After Cell What’s There?

How do all living organisms perform for their survival?

The animals which are multicellular, their body are created by many organs collectively. The meagerest worker among them is the cell and then comes the tissues. Now let us consider an example of a hydra. In hydra, thousands of cells are designed in such a manner to form different specialized cell types. Then in the same direction in a more complex organism such as a human being, a very large number of cells are arranged collectively to form about 200 different types of specialized cells. A group of cells is arranged together in such a manner that they collectively perform a specific role. This group is called tissue. Tissues are the second level in the levels of biological organization. A Group of tissues makes up organs in the body such as the brain and heart.

They are determined between cells and organs. There are 4 types of tissues in animals:1.connective 2.muscle 3.nervous 4.epithelial

In plants tissues are divided into three types:1.vascular 2.ground 3.epidermal

What’s the specific definition?

Thus a tissue can be defined as “A group of one or more types of the physically linked cell having a similar origin and specialized for a specific function or functions along with the intercellular material if any,”

Who discovered this?

The word tissue was first minted by Marie Francois Xavier Bichat. He was the chief to propose that tissue is a central element in humans anatomy and he acknowledged organs as the collection of often diverse tissue, rather than entities in themselves. Xavier Bichat was a French anatomist and physiologist. He penned down the detailed knowledge about the concept of tissue in his book named ‘Anatomic Generale’. Where he described 21 human tissues. Which can be subsumed below four divisions. Which is currently approved by histologists.

From where this word has come?

The word tissue was acquired from an old French verb “tissu” which has a meaning to weave.

How can they be studied?

The deep microscopic analysis of the tissues and organs along with their functions is known as histology which is also known as microscopic anatomy or microanatomy. And the person who is specialized to perform this research is known as a histologist. The word histology i.e. the study of tissues was first to come to view in a book by Karl Meyer in 1819.

From where these tissues have developed?

They are arisen from the undifferential cells of the germ layers in an embryo through a dual process of cell multiplication by mitosis and cell differentiation by inactivation of specific genes.