About as big as your fist
36,792,000
Not mine, but an average man's fist.
We humans have one heart with four pumping chambers.
60-100 bpm
The average for humans is 4,500 at a rate of 75 beats per minute.
A polar bears moth is double the size of an average humans mouth
The average size of the human heart is as big as your fist.
no, it is not. It's slightly bigger than the average grown up eye
The horses' heart is 2-3 times larger then the humans heart. although They aren't that different besides size. They are both mammals and all mammals have a heart that works exactly the same (besides size).
It depends on which species you are talking about. If you are talking about humans then it is because on average heart size is connected to body size and on average men are bigger. Men also have higher levels of hormones that encourage muscle production
big as the adult's heart
The Big heart