Relier Pairs HUMAN BIOLOGYVersion en ligne LINK NAME AND DEFINITION par Guy Kruse 1 hormone 2 muscle tissue 3 nervous tissue 4 epithelial tissue 5 organ 6 cells 7 cardiovascular system 8 connective tissue 9 tissue 10 organ system Structure made of two or more tissues that work together. A chemical messenger molecule. Layers of tightly packed cells that line the surfaces of the body. Group of cells that are all involved in supporting and binding other tissues of the body; i.e. tendon, cartilage, bone, and blood. Organs that work together to serve a common purpose. Group of nerve cells that sense stimuli and transmit signals; found in brain, spinal cord, and nerves. Bands of cells that contract and allow movement. Basic unit of structure and function of a living organism; the basic unit of life. Organ system made up of the heart, blood, and blood vessels. Group of similar cells working together.