ZME Science on MSN3d
The heart may have its own “mini-brain”: a nervous system that controls heartbeat
The human heart beats 60-100 times a minute, without you needing to pay any attention to it. Heart function is controlled by ...
PBS1y
Amazing Heart Facts
Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times. Give a tennis ball a good ...