1.Circulatory system / Cardiovascular system: Circulates blood around the body via the heart, arteries and veins, delivering oxygen and nutrients to organs and cells and carrying their waste products away. Keeps the body's temperature in a safe range. 2.Digestive system and Excretory system: System to absorb nutrients and remove waste via the gastrointestinal tract, including the mouth, esophagus, stomach and intestines. Eliminates waste from the body. 3.Endocrine system: Influences the function of the body using hormones. 4.Integumentary system / Exocrine system: Skin, hair, nails, sweat and other exocrine glands 5.Immune system and lymphatic system: Defends the body against pathogens that may harm the body. The system comprising a network of lymphatic vessels that carry a clear fluid called lymph. 6.Muscular system: Enables the body to move using muscles. 7.Nervous system: Collects and processes information from the senses via nerves and the brain and tells the muscles to contract to cause physical actions. 8.Renal system / Urinary system The system where the kidneys filter blood to produce urine, and get rid of waste. 9.Reproductive system: The reproductive organs required for the production of offspring. 10.Respiratory system: Brings air into and out of the lungs to absorb oxygen and remove carbon dioxide. 11.Skeletal system: Bones maintain the structure of the body and its organs.