Choose the word of the correct answer 2 chambers 4chambers fists heart ventricles atrium rib cage blood blood vessels valves pericardium myocardium circulatory system respiratory system 1. ___ is responsible for the distribution of food nutrients and oxgen to all parts of the body. 2. The size of the heart is as big as our __. 3. The ___is the central pumping station of the body. 4. The ___recieves blood 5. The __sends out blood 6. There are __ chambers of the heart 7. The circulatory system has three important parts. The ___, 8___ and 9___. 10. The heart and lungs are protected by __. 11. The heart beats at a rate of ____/minute. 12. With it beat, it pumps __ liters of blood 13. The muscular wall of the heart is called___ 14. The heart is covered by a sac called __. 15. The ___ separates the atrium from the ventricles. ​