1) The skeletal system makes these for the circulatory system a) heart b) bones c) veins d) red blood cells e) ribs 2) After the digestive system does its job, what system gets nutrients to the cells? a) circulatory b) digestive c) excretory d) immune e) nervous f) skeletal 3) What system helps protect your heart and lungs from injury? a) circulatory b) digestive c) immune d) nervous e) muscular f) skeletal 4) This part of the muscular system is found inside tubes that move materials such as food and blood. a) smooth muscle b) skeletal muscle c) cardiac muscle d) esophagus e) arteries f) heart 5) This part of the muscular system moves bones. a) smooth muscle b) skeletal muscle c) cardiac muscle d) cartilage e) ribs 6) The heart is part of the circulatory system and also of this system. a) circulatory b) digestive c) excretory d) immune e) nervous f) muscular 7) Inside the lungs, oxygen needed by cells is transferred to this system. a) circulatory b) digestive c) immune d) muscular e) respiratory f) skeletal 8) The white blood cells are part of 3 systems: the immune system, and these 2 systems: a) respiratory and skeletal b) nervous and circulatory c) circulatory and skeletal d) muscular and nervous e) digestive and circulatory 9) The part of the respiratory system that makes lungs expand and contract is also a part of this system. a) digestive b) cardiovascular c) immune d) muscular e) skeletal f) nervous 10) The digestive system can only move food and nutrients from the mouth to the stomach with the help of this system. a) digestive b) excretory c) immune d) skeletal e) muscular 11) Without the help of this system, the cardiovascular system would continue to be full of cellular waste. a) digestive b) excretory c) skeletal d) muscular e) nervous 12) This system makes sure your food is digested, oxygen is absorbed, and the heart continues to pump even when you're asleep. a) immune b) excretory c) skeletal d) nervous 13) A virus that gets into your lungs could kill you without the help of this system. a) circulatory b) digestive c) excretory d) immune e) respiratory

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