1) The heart is a part of the ____________________________ system. a) respiratory b) digestive c) circulatory d) excretory 2) The intestines are part of the __________________________ system. a) respiratory b) digestive c) circulatory d) excretory 3) The lungs are part of the ______________________________ system. a) respiratory b) digestive c) circulatory d) excretory 4) The kidneys are a part of the ___________________________ system. a) respiratoy b) digestive c) circulatory d) excretory 5) When we breathe, the air enters our body through our _____________________________-. a) ears b) nose and mouth c) eyes d) hands 6) After we breathe in, the air pass through a tube called the ___________________________. a) trachea b) lungs c) kidneys d) intestines 7) The most important organs of the respiratory system are the _________________________. a) trachea b) lungs c) heart d) stomach 8) To live, we need to breathe in ________________________. a) carbon dioxide b) nitrogen c) methane d) oxygen 9) The digestive system is responsible for ________________________. a) breathing b) digestion c) excretion d) blood circulation 10) Out digestive system helps our bodies obtain energy from ______________________________. a) food b) hamburgers c) sushi d) pizza 11) Our digestive system is responsible for extracting ____________________________ from our foods. a) oxygen b) water c) nutrients d) atoms 12) Nutrients are transported around our body via our _________________________ system. a) respiratory b) digestive c) circulatory d) excretory 13) The circulatory system is responisible for carrying nutrients and _____________________ all over the body. a) carbon dioxide b) oxygen c) methane d) nitrogen 14) The circulatory system also eliminates waste through the kidneys in the form of ____________________________. a) carbon dioxide b) oxygen c) feces d) urine 15) It also eliminates _________________________ through the lungs. a) urine b) oxygen c) carbon dioxide d) feces 16) The circulatory system does many other things as well (more than one answer)... a) regulates body temperature b) transports hormones c) involved with the immune system d) excretes excrement 17) The excretory system eliminates __________________________. a) blood b) carbon dioxide c) waste (desechos) d) urine 18) The kidneys create ____________________________. a) urine b) waste (desechos) c) blood d) oxygen 19) There are two tubes that bring the urine from the kidneys to the ___________________________. a) lungs b) heart c) trachea d) bladder 20) The body also gets rid of waste through the _____________________________. a) lungs b) skin c) trachea d) bladder

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