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The heart is the system's pump and the blood vessels are like the delivery routes and it is a muscle. The pumps are the beat. The heart is a muscle about the size of a fist and it is the muscle in the body that works the hardest. The statement that the heart muscle rests only between beats is true
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It's harder because you can't hear the emotion in their voice as if you were actually speaking to them. Someone over text could say they are fine with 17 million happy face emojis but behind there screen they could be crying. You never know. You can't see them either to read the persons face of emotion.
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