muscle action you can control; includes muscles attached to bones and organsvoluntary musclestrong bands of connective tissue; cover the ends of bones and helps cushion the areas where bones meetligamentsmotor neurons that you do not have to think about; includes digestion and heartbeatautonomic nervous systemmuscle action you cannot control; includes heart, digestive tract, and blood vesselsinvoluntary muscleorgan system: heart, vessels, and blood; transports nutrients and waste throughout the body; also called the circulatory systemCardiovascular Systemorgan system: breaks down the food you eat into nutrients that your body can absorb; includes the mouth, esophagus, stomach, and intestines → Endocrine SystemDigestive Systemorgan system: includes glands such thyroid, pituitary gland, and pancreas; glands send out chemical messages; includes hormones → Digestive SystemEndocrine Systemhuman body works to keep itself stable; cells, tissue, and organs work together to maintain a stable environment → homeostasishomeostasisorgan system: returns leaked fluids to blood vessels and helps get rid of bacteria and viruses; includes the thymus, spleen, tonsils, and appendix → Lymphatic SystemLymphatic Systempart of the nervous system that includes the brain and spinal cord; takes in and responds to information → peripheral nervous systemcentral nervous system
