Control centre of the body, Pumping organ of our body , Blood vessel carrying pure blood from heart , Air filled bags present inside our chest, Breaking down of food , so that body can use it is called , The upper 2 chambers of our heart , Blood vessels bringing impure blood back to heart , Chemical factory of our body , Internal organ where digestion is completed , Largest internal organ of our body , Digestive juice produced by liver , Bony structure protecting heart , Bony structure protecting brain , Lower 2 chambers of heart , Reddish brown organ of the size of our fist, How many times a healthy heart beats , Breathing in of air is called , When we breathe out our lungs , The undigested food passes into , Organ which removes liquid waste from our blood , Bean shaped organs of our body , Doctors use to hear our heart beat , Organ doing exchange of gases, Arteries and veins are joined by , Brain sends and receives messages through , Total number of bones in adult human body , Total number of muscles in human body , Lungs are protected by this bony structure , Body organ working when we listen to music, Body system used while walking .

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