What are the different tissues in the human body?

Tissue is a cellular level between cells.A tissue is an ensemble of cells and matrix from the same origin that carry out a specific function.Organs are formed by grouping multiple tissues.

The English word "tissue" is derived from the French word tisse, meaning "to weave".

The study of human and animal tissues is known as histology.The discipline for plants is called plant anatomy.The classical tools for studying tissues are the paraffin block in which tissue is embedded and then sectioned, the histological stain, and the optical microscope.The use of frozen tissue-sections has improved the detail that can be observed in tissues.The classical appearance of tissues can be examined in health and disease with these tools.

There are four basic types of animal tissues.Organs are collections of tissues joined in units to serve a common function.The four tissue types can vary depending on the type of organisms.Different classifications of animals may affect the origin of cells in a particular tissue type.

The vasculature in all animals is composed of a specialized type of epithelium that is derived from the ectoderm and endoderm.A true epithelial tissue is only present in a single layer of cells that are held together by tight junctions.This tissue covers all of the surfaces that come in contact with the environment outside.It serves functions of protection, secretion, and absorption and is separated from other tissues.

The cells that cover the organ surfaces are the ones that make up the epithelial tissues.This tissue provides a barrier between the external environment and the organ it covers, because the cells are linked via semi-permeable, tight junctions.In addition to this protective function, the tissue may also function in other ways.Epithelial tissue protects organs from injury.

There are many different types of epithelium.A classification scheme combines a description of the cell-shape in the upper layer with a word describing the number of layers.There are other cellular features that may be described in the classification system.There are some common kinds of epithelium.

The term connective tissues refers to tissues made up of cells separated by non- living material.The matrix can be either liquid or rigid.Blood and bone's matrix are both rigid.Organs are held in place by connective tissue.There are many different types of tissues that are examples of connective tissues.A method of dividing the tissues is to divide them into three different types.

Muscular tissue is the active contractile tissue of the body.Muscle tissue causes motion within internal organs.Visceral or smooth muscle, found in the inner linings of organs, is one of three different categories of muscle tissue.

The cells of the central and peripheral nervous systems are classified as neural tissue.Neural tissues form the brain and spine.Neural tissues form the cranial nerves and spinal nerves in the peripheral nervous system.

Plants have three tissue systems: the epidermis, the ground tissue, and the vascular tissue.

The increase in length and thickness of the plant is caused by the dividing cells.The tips of stems and roots are where the primary growth of a plant occurs.meristematic tissues are present in these regions.The cells in these tissues are rectangular in shape and have thin cell walls.As the new cells grow and mature, their characteristics slowly change and they become differentiated as components of the region of occurrence of meristematic tissues, being classified as:

The primary cell wall of meristematic tissues is made up of cellulose.There are no inter-cellular spaces between them.Each cell has a nucleus and a dense cytoplasm.There are very few vacuoles in the dense protoplasm of meristematic cells.The meristematic cells are usually rectangular in shape.

Meristematic tissue cells have a large nucleus with small vacuoles as they don't need to store anything, compared to their function of multiplication and increasing the size of the plant, and no intercellular spaces.

Permanent tissues are a group of cells that have lost their ability to divide and have been placed at fixed positions in the plant body.The ability to divide is lost when tissues take a specific role.The process of taking up a permanent shape, size and function is called cellular differentiation.Different types of permanent tissues are formed by cells of meristematic tissue.There are 3 types of tissues.

Simple permanent tissue is a group of cells that are similar in structure and function.They are of three different types.

The bulk of a substance is Parenchyma.Plants have relatively unspecialized living cells with thin cell walls that are usually tightly packed so that intercellular spaces can be found between cells of this tissue.These are usually in shape.Sometimes they contain a small number of vacuoles.The vacuole is much smaller if they do so.Plants and food are supported by this tissue.There is a type of parenchyma that performs photosynthesis.The aerenchyma tissues in aquatic plants help them float on water.The idioblasts are Parenchyma cells.Succulent parenchyma noted that there was Spindle shape fiber in this cell to support them.Parenchyma tissues store water.

"Colla" and "enchyma" are Greek words that mean gum and infusion, respectively.Like Parenchyma, it is a living tissue.The cells are thin and have a number of cells join together at the corners.The cells of this tissue are very small and have very little inter-cellular space.Hypodermis of stems and leaves is where it occurs.It is not present in monocots or roots.

There is a supporting tissue in the stems of young plants.It supports the plant body with mechanical support, elasticity, and strength.It helps in storing sugar.It is present in the leaves and resistant to the wind.

"Sclero-" means hard and "enchyma" is a Greek word.This tissue is made of dead cells and has no protoplasm.The secondary walls of these cells are very thick and have a function of providing mechanical support.There is no inter-molecular space between them.Lignin deposition is so thick that the cell walls become impermeable to water, which is also known as a stone cell.Sclerenchyma fiber and sclereids are the two types of tissues.The scleroenchyma fiber cells are long, narrow and unicellular.The cells that make up fibers are strong and flexible.Sclereids are brittle and have thick cell walls.

The surface of the plant is made up of a single layer of cells.The entire surface of the plant has a layer of skin.It is also called surface tissue.Most of the cells are flat.The inner walls are thinner than the outer walls.The cells form a sheet.It protects the plant.The outer layer of the skin is covered with a thick layer.The singular:stoma helps in transpiration.

There are more than one type of cells in the complex tissue.The transportation of organic material, water, and minerals is aided by complex tissues.It is also known as conducting and vascular tissue.There are some common types of permanent tissue.

It is responsible for the movement of water and minerals.The main axes of stems and roots are organised in a tube-like fashion.It includes parenchyma cells, fibers, vessels, tracheids, and ray cells.Tubes made up of individual cells are called vessels tracheids.There may be bars of wall material on the inside.These cells are joined together to form tubes.At maturity, vessel members and tracheids are dead.Tracheids have thick secondary cell walls.They don't have end openings like the vessels.There are pairs of pits present at the end of the tracheids.Water can be passed from cell to cell.