Assuming an average of 80 beats per minute and you live to be 80 years old, your heart would have beaten approximately about 3.3 billion times. It is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. Never resting even for a second, this muscular organ provides life-giving oxygen throughout the body.
Researchers from the University of Oxford in the UK have shown that the first contraction of the heart muscle occurs 7.5 days after conception in mice, which they extrapolated to be as early as day 16 in humans.
Sometime ago National Geographic did a great video animation on the anatomy of the heart. Here it is for your watching pleasure:
