Because they are just about the same size - and you can see your own fist.
The size of the heart just happen to be the same size as your fist, no mater your age. It is just one of those interesting things.
The heart is a organ-muscle that is about the same size of your fist.
the answer is the heart
heart
Depends on the breed of mouse you are talking about, the common house mouse only gets about 3-2cm from the ground to it's back, and 5cm or so in length (NOT including it's tail) nooooooooooooooooooooo they are 101010100000 feet biiigigigiigigiiigigigigioggg
Your heart is located in the left upper quadrant of the torso. (Your left, not the left of whoever is looking at you.) To approximate the location (and size): * extend your thumb and pinkie of your right hand as far to the sides as you can, bending the other 3 fingers. * place your thumb on the central notch in your collar bone and your pinky as far down your sternum (breast bone) as it comfortably falls with your thumb in place. * leaving your pinkie touching where it is, bring the rest of your hand down and to the left, forming a fist * Your fist symbolizes the size and location of your heart. Your heart shares the thoracic cavity with your lungs and stomach.
Because for any human of any age, their heart IS about the size of their closed fist.
The average size of the human heart is as big as your fist.
The human heart is a pear-shaped structure about the size of a fist.
Your heart size can be measured by looking at your very own fist. For most people it is about the size of your fist.
The size of a human heart will be equivalent to the size of his/her fist.
The human heart is about the size of your fist.
The size of every human's heart is equal to a FIST.....
it is the size of your fist.
The human heart.
the size of their fist!
The normal size of a human heart is said to be about the size of your fist. As the size changes for all ages and sizes of organisms.
Usually when people reference the heart to something it is relating the size of it to your fist.