For most of history, the human heart has been regarded as a forbidden organ too delicate to tamper
                               withrom  the moment heart begins beating until the moment it stops, the human heart works tirelessly.
                               In an average lifetime, the heart beats more than two and a half billion times, without ever pausing to
                               rest.Like a pumping machine, the heart provides the power needed for life.

                                                            
                                                                                                                   The circulatory system is composed of vessels
                               and muscles that control the flow of blood around the body. This process of blood flowing around the
                               body is called circulation. The main components of the circulatory system are the heart, arteries,
                               capillaries and the veins.
 

                             Let's take a look at how blood travels around your body !The first step of Blood leaves the heart from the
                              left ventricle into the biggest artery, called the aorta. The heart is a strong muscle,
                              which is divided into 4 compartments (the left and right atrium and ventricles). It
                              is important that fresh blood from the aorta goes directly to the brain, because
                              the brain needs oxygen constantly otherwise we get irreversible damage.Another
                              important organ for the blood to pass through is the lung. Here waste carbon
                              dioxide is replaced  with fresh oxygen. The pressure in the arteries is higher than
                              in the veins. Blood returns to the heart through the veins.
 
 
 

                                    Go to have more informations about what's the job of your heart ~!

                                                              Did you know your heart beats over 100,000 times a day?
                                  Here , you may know the size of your heart .
                                                                                   Let me tell you how to have a healthy heart .
 
 

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