The "thump thump" of the heart beat is the sound made by the four valves of the heart closing.
2) When does the heart actually start beating?
The heart begins to beat at four weeks after conception and continue to beats till one's death.
3) Does the rate the heart beats differ according to gender?
A woman's heart typically beats faster then a mans. The heart of an average man beats approximately 70 times a minute, whereas a woman's heart beats 78 times a minute.
http://my.clevelandclinic.org/heart/heart-blood-vessels/how-does-heart-beat.aspx
Interesting questions - try linking the website with more informaiton to your blog in case someone wants more info or to see where you got your information from... I wonder why there is a gender difference in resting heart rate?
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