bIoLOgY...(CiRCuLaTOrY SysTeM)

 

Diagram of human heart

 

FROM YOUTUBE

to know more explaination, click this link:

http://www.youtube.com/watch?v=1tvADfnJY38&feature=related 

MotiVaTiONaL WoRD

ConFusE???????

What should I select for the UPU?

 
what the appropriate course to me?

physics????      biology????

 
chemistry????          mathematics?????