Tissues

By Taylor Rhodes

What is a tissue?

A tissue is a the combination of different cell types that creates a collection of specialized cells and cell products that perform a relatively limited number of functions.

What are the four types of tissues?

The four types of tissue are epithelial, connective, nervous, and muscular.

Epithelial tissue is the surface of your skin. It is made up of epithelia and glands. Epithelia are layers of cells that cover internal or external surfaces. Glands are the structures that produce fluid secretions which are attached or come from the epithelia.

Connective tissue creates all types of epithelial tissue. This tissue varies in appearance and function. However, all connective tissue involves: specialized cells, extracellular protein fibers, and fluid known as ground substance.

Nervous tissue can also be known as neural tissue. Conducts electrical pulses from one area of the body to another. The brain and spinal cord are the control centers of the nervous system. About ninety-eight percent of the neural tissue is concentrated at the control centers.

Muscular tissue ables the body of movement. Muscular tissue specializes for contraction. There are three types of muscle tissue. Skeletal muscle, which forms large muscles and gross body movements. Cardiac muscle, found only in the heart and is responsible for blood flow. Lastly, smooth muscle tissue, which is found in walls of visceral organs. It also provides elasticity.

Classification

The epithelial is classified into simple epithelial and stratified epithelial. Connective tissues are classified into three sections: connective tissue proper, fluid connective tissues, and supporting connective tissues. Nervous tissue only contains two types of cells which are neurons and neuroglia. Muscular tissue is classified by skeletal muscle tissue, cardiac muscle tissue, and smooth muscle tissue.

Specialization of Epithelial

Epithelial cells can be specialized for the movement of fluids over epithelial surface which provides protection and lubrication, the movement of fluids through the epithelium to control permeability, or the production of secretions that provide physical protection.

Location

Epithelial tissue can be found all over the body (skin). Connective tissue is primarily located in joints. Nervous tissue is found in the brain and spinal cord. Muscle tissue can be found in any muscle of the body.

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