heart

Here's a thought. an average person's heart rate goes from about 60 - 90 beats per minute. If you have lived for 21 years as I haved.. your heart has 'beated' about 827,820,000 times.

you gotta give cred to your heart, it never stops working. So spare it of the heartache sometimes and be happy.

I've been wanting to find out more about the human heart for awhile now.. ever since a friend and I shared this random query about what causes heartaches.. I know you're thinking, sadness.. lost of love.. blah blah.. but I'm really wondering down to the physiological level.. what causes it.. that sour feeling in your heart.. (and sometimes the sour feeling is a good one, sometimes bad)

so I did some googling/wiki/howstuffworks.. tried pretty much every site I know but I couldn't any solid answers. found some similar questions only to find that they have trouble finding answers too..

It's pretty obvious it's gotta do with certain chemicals and hormones in our bodies.. but I haven't found any specifics or explanations.

all I can say is that. I guess humans are just wired that way. For survival purposes..