http://www.youtube.com/user/embriologiapozos?feature=watch
http://books.google.com.co/books?id=vP_lwaVKrz4C&pg=PA101&lpg=PA101&dq=FARMACOLOGIA+DEL+SISTEMA+SANGUINEO&source=bl&ots=gxlXMAsbMx&sig=7_u2Q9UkPL3PBBqlNT5rnx1t4Gg&hl=en&sa=X&ei=uShBUdHMN7PD4APl-IDYDw&ved=0CFUQ6AEwBQ