Animal tissues are groups of similar cells that perform a specific function. Based on structure and function, animal tissues are classified into four main types.
Epithelial tissue forms the covering or lining of body surfaces, cavities, and organs. It provides protection, absorption, and secretion.
Connective tissue supports, binds, and connects other tissues. It includes bone, cartilage, blood, and adipose tissue.
Muscular tissue is responsible for movement of the body and internal organs through contraction and relaxation.
Nervous tissue receives stimuli and transmits nerve impulses. It is mainly found in the brain, spinal cord, and nerves.