The Human Heart is pretty amazing! It's the power house of our circulatory system. One muscle with four chambers that pumps about 1900 gallons of blood every single day! That's pretty impressive considering that this vital organ only weighs about 10 ounces. Don't let size fool you though, the heart's work goes a long way, literally! The average adult human circulatory system can actually reach about 60,000 miles. That's enough to wrap around the Earth four times!! On top of all this, as if that were not impressive enough, the human heart will beat about 3 billion times in a full lifetime! Pretty impressive! No wonder we all <3 the human heart!