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