Tissues

Tissues are defined as a group of cells associated together and performing a common function. Tissues are further divided into different types depending upon their functions or morphology. Each kind of body tissues has its own job to do that no other kind of tissue does. So, each kind of tissue is special. Tissues are divided into four types.
Epithelial Tissues: These are found as outer most layer of an organ, or as lining of body invaginations and tubular parts.
Connective Tissues: This is composed of semi fluid matrix containing a variety of cells and fibers. These are supporting tissues.
Muscle Tissues: This tissue is composed of contractile cells or fibers. They have the ability to contract and relax.
Nerve Tissues: It is composed of nerve cells which are called neurons. These produce nerve impulse to conduct messages.