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