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MAJOR ORGAN SYSTEMS IN THE HUMAN BODY THE 11 MAJOR ORGAN SYSTEMS OF THE HUMAN BODY: Circulatory Digestive Endocrine Excretory Immune Muscular Nervous Reproductive Respiratory Skeletal Integumentary 1) Cardiovascular/Circulatory System Major Structures: Heart, Blood vessels, Blood (cardiovascular), lymph nodes and vessels, lymph (lymphatic) Functions: Transports nutrients, wastes, hormones, and gases 2) Digestive System Major Structures: Mouth, Throat, Esophagus, Stomach, Liver, Pancreas, Small intestine, Large intestine Functions: Extracts and absorbs nutrients from food; removes wastes; maintains water and chemical balances 3) Endocrine System Major Structures: Hypothalamus, pituitary, pancreas Functions: Regulates body temperature, metabolism, growth and development, and reproduction; maintains homeostasis; regulates other organ systems 4) Excretory System Major Structures: Kidneys, urinary bladder, ureters, urethra, skin, lungs Functions: Removes wastes from blood; regulates concentration of body fluids 5) Lymphatic (Immune System) Major Structures: White blood cells, lymph nodes and vessels, skin Functions: Defends against pathogens and disease 6) Integumentary System Major Structures: Skin, nails, hair Functions: Protects against injury, infection, and fluid loss; helps regulate body temperature 7) Muscular System Major Structures: Skeletal, smooth, and cardiac muscle tissues Functions: Moves limb and trunk; moves substances through body; provides structure and support 8) Nervous System Major Structures: Brain, spinal cord, nerves, sense organs Functions: Regulates behavior, maintains homeostasis; regulates other organ systems; controls sensory and motor functions 9) Reproductive System Major Structures: Testes, penis (males), ovaries, uterus, breasts (females) Functions: Produces gametes and offspring 10) Respiratory System Major Structures: Lungs, nose, mouth, trachea Functions: Moves air into and out of the lungs; controls gas exchange between blood and lungs 11) Skeletal System Major Structures: Bones and joints Functions: Protects and supports the body and organs; interactions with skeletal muscles; produces red blood cells, white blood cells, and platelets * We’ll be taking a look at how all the systems must work together as one unit for the human body to function properly. * You’ll be taking a look at the problems that can arise in each of the organ systems.