The epithelial tissue is the first line of defense.
The Human Body has 4 Basic Tissues. These are:
1) Connective Tissue - gives shape to organs and holds them in place.
2) Muscle Tissue - produce force and cause motion within the internarl organs
3) Nervous Tissue - main component of the nervous system. It regulates body function and activity
4) Epithelial Tissue - lines the cavities, surfaces of blood vessels and organs though the whole body.