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