Muscular system  - This system is made up of muscles that allow your body to move. Some muscles move your skeleton (like biceps and quadriceps), while others work automatically (like your heart and the muscles in your stomach). Muscles work in pairs — when one contracts, the other relaxes.., Nervous system - This system includes your brain, spinal cord, and nerves. It controls all body activities by sending electrical messages throughout your body. It lets you think, feel, move, and react to what’s happening around you., Digestive system - This system system breaks down food into nutrients your body can use for energy, growth, and repair. It includes organs like the mouth, stomach, small and large intestine. Waste that your body doesn’t need leaves through the intestines., Skeletal system - This system is made up of bones, cartilage, and ligaments. It gives your body shape and support, protects organs, and helps you move when muscles pull on bones., Circulatory system - This system moves blood throughout your body. The heart, blood vessels, and blood work together to carry oxygen, nutrients, and waste to and from your body’s cells., Respiratory system - The respiratory system helps you breathe. It brings oxygen into your body and removes carbon dioxide. Air travels through your nose or mouth, trachea, and lungs, where oxygen moves into the blood and carbon dioxide leaves the blood.,

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