lymph nodes and vessels, white blood cells

provides protection against infection and disease


mouth, esophagus, stomach, liver, pancreas, small and large intestines

stores and breaks down food; absorbs nutrients; eliminates waste


kidneys, ureters, bladder, urethra, skin, lungs

eliminates waste; maintains water and chemical balance


brain, spinal cord, nerves, sense organs, receptors

controls and coordinates body movements and senses; controls consciousness and creativity; helps monitor and maintain other body systems


glands (such as adrenal, thyroid, pituitary, and pancreas); hypothalamus and specialized cells in the brain, heart, stomach, and other organs

maintains homeostasis; regulates metabolism, water and mineral balance, growth, behavior, development, and reproduction


ovaries, uterus, mammary glands (in females), testes (in males)

produces eggs and milk in females, sperm in males, and offspring after fertilization

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