Digestive System - mouth, esophagus, stomach, intestines; breaks down food into its chemical components for cellular needs, Respiratory System - trachea, lungs; exchanges O2 and CO2, Nervous System - brain, spinal cord, neurons; to receive and transmit messages throughout the body, Skeletal System - bones; provides structure and support, Muscular System - muscles, tendons, ligaments; to facilitate movement, Endocrine System - Glands (pituitary gland, pancreas, etc); produces, stores, and releases hormones , Immune System - Consists of Lymph, Lymph Vessels, Lymph Nodes, and white blood cells; prevents antigens from entering the body and attacks any antigen that does enter, Circulatory System - heart, blood, arteries, veins, capillaries; pumps blood to all cells to deliver oxygen and nutrients and remove carbon dioxide and waste, Reproductive System - Testes, ovaries; to produce sperm and egg cells for sexual reproduction, Excretory System - Major structures include the skin, lungs, liver and kidney which work to remove wastes from the body , Integumentary System - Consists of the skin, hair, nails, and glands,

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