Matching Pairs HUMAN BIOLOGYOnline version LINK NAME AND DEFINITION by Guy Kruse 1 organ 2 organ system 3 muscle tissue 4 hormone 5 nervous tissue 6 tissue 7 epithelial tissue 8 cells 9 connective tissue 10 cardiovascular system Layers of tightly packed cells that line the surfaces of the body. Group of similar cells working together. Basic unit of structure and function of a living organism; the basic unit of life. 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. Organs that work together to serve a common purpose. A chemical messenger molecule. Organ system made up of the heart, blood, and blood vessels. Structure made of two or more tissues that work together. Group of nerve cells that sense stimuli and transmit signals; found in brain, spinal cord, and nerves.