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heartlungsskeletal systemORGAN SYSTEMS OF OUR BODY THE CIRCULATORY SYSTEMPut your hand a little to the left of the middle of your chest. Can you feel something tick? That is your heart. The ticking of the heart is called heart beat. The function of your heart is to pump blood through your body. Your heart does this all the time. But how does blood flow through the body? It goes around in special tubes called blood vessels. The heart, the blood and the blood vessels are the main parts that make up the circulatory system.THE RESPIRATORY SYSTEMYou breathe in air through your nose. But where does the air go from there?It passes through the windpipe and reaches your lungs.The nose, the windpipe and the lungs make up the respiratory system.Your heart is the size of your fist.Did you know?Your heart beats 72 times a minute.Your heart works non-stop all your life.Did you know?There are 206 bones in your body.Did you know?What are the three main parts of the circulatory system?CheckpointWhat are the main parts of the respiratory system?CheckpointTHE SKELETAL SYSTEMPress the different parts of your body. You can feel something hard inside. These hard parts are your bones. All the bones in your body together form the skeleton.The skeleton gives shape and support to your body. Without the skeleton, you will be a shapeless and formless mass of flesh. The skeleton also protects all the organs inside your body.The basic framework of a skeleton in our body and its tissues are called skeletal system.Arrow-Puffin-3_Semester-1 Science 255