The speed of heartbeat is related to the length of life. How much is the heart rate?
In addition, scientists have also found that animals with slower heartbeat live longer. For example, small mice have a heart rate of 500 beats per minute, and the average life span is about 3 years; Cats and dogs 100 times / minute, with a life span of about ten years; Whales, on the other hand, have a heart rate of 15-20 beats per minute and a life span of more than 80 years.