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