what are the 11 major body systems?
['Circulatory system: ... ', 'Digestive system and Excretory system: ... ', 'Endocrine system: ... ', 'Integumentary system / Exocrine system: ... ', 'Immune system and lymphatic system: ... ', 'Muscular system: ... ', 'Nervous system: ... ', 'Renal system and Urinary system.']