The heart is an important organ in our body. In our heart, there is the ciculatory system. First, the heartbeat fills the chambers with blood then pumping the blood through our body. Next, the blood vessels carry blood away from the heart.
We have a lot of blood vessels in our body. If our blood vessels were lined up end to end, they will wrap around the earth twice. The heart which sends blood to all these tubes is surprisingly amall.
You know, the adult heart beats is about 70 times per minutes or 4,200 times in one hour. It also pumps 7,500 liters of blood daily. It same as we can fill a small swimming pool.
Written by : Threesa Afrulli (16611012)
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