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