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The human body is a complex and fascinating machine that continues to amaze scientists and medical professionals alike with its intricate systems and processes. The human heart beats approximately 100,000 times per day, pumping around five quarts of blood through the circulatory system. The heart is made up of four chambers: the left and right atria and ventricles. The atria receive blood from the veins and pump it into the ventricles, which then pump the blood out to the body. The human brain contains over 100 billion neurons, each one capable of transmitting information to other neurons through electrical and chemical signals. The brain processes this information at speeds of up to 268 miles per hour, making it one of the fastest computers in the world.