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