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