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Tissues are groups of cells similar in structure and function. There are four primary tissue, epithelial, connective, nervous and muscle tissue. Epithelial tissue, is the lining, covering, and glandular tissues of the body. The major connective tissue types include bone, cartilage, dense connective, loose connective tissue, and blood. Muscle tissues like skeletal muscle, cardiac muscle and smooth muscle are specialized to contract, or shorten, to produce movement. Neurons in nervous tissue function with supporting cells that insulate, support, and protect the delicate neurons, make up the structures of the nervous system-the brain, spinal cord, and nerves.