Matching Pairs Tissues, Organs, and Body SystemsOnline version Review the tissue, organ, and body systems. by Janelle Ruiz 1 Respiratory System 2 Nervous System 3 Epithelial Tissue 4 Connective Tissue 5 Digestive System 6 Muscular System 7 Circulatory System Supports organs and joins tissue Lines organs and protects inside of body from outside world Brain, spinal column, axons Responsible for gas exchange (oxygen- carbon dioxide) with the outside environment Heart, veins, capillaries