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Name: ___________________________________ #: _______ Date: _________________________________ Human Body Systems Study Guide Directions: For each body system listed below, you will need to know the main function and major organs (or tissues) of that system. Body Main Function System Major Organs (or Tissues) The main function of the circulatory system is to transport oxygen and nutrients to your cells around your body. The main function of the respiratory system is to bring oxygen into your body and remove carbon dioxide waste. The main function of the excretory system is to remove liquid waste from the body. The main function of the digestive system is to bring nutrients into your body and remove solid waste. Heart, blood vessels, blood Muscular The main function of your muscular system is to move your body and things within your body. Cardiac muscles, skeletal muscles, and smooth muscles Skeletal The main function of your skeletal system is to provide structure to your body. The main function of your immune system is to protect your body from viruses and bacteria invading your body. The main function of your integumentary system is to be the first line of protection for your body. The main function of your nervous system is to control your other body systems and send messages between organs of your body and your brain. Bones Circulatory Respiratory Excretory Digestive Immune Integumentary Nervous Mouth and nasal passage, trachea, lungs, diaphragm Kidneys, ureters, bladder, urethra Mouth, esophagus, stomach, small intestine, large intestine White blood cells Skin, hair, nails Brain, spinal cord, nerves