The human heart…The human heart is a hollow,muscular organ which is about the size of an adult fist.It pumps blood by contracting and relaxing its muscles.The heart beats because it is pumping blood,and if u actually feel the lower left part of your breastbone you will be able to feel it.When the heart muscles contract,blood is squeezed out of the heart and then into the blood vessels.When the heart muscles relax,blood flows back into the heart through the blood vessels.

Blood…You can see how blood looks like under a microscope.Blood carries food,carbon dioxide,oxygen and other materials tfrom one part of your body to the other.

BYE!!!!

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