SISTEMAS; DIGESTIVO, RESPIRATORIO, CIRCULATORIO

SISTEMA DIGESTIVO
https://www.youtube.com/watch?v=RMLVL7Ygzus

SISTEMA RESPIRATORIO
https://www.youtube.com/watch?v=BtxN_rInnpc

SISTEMA CIRCULATORIO
https://www.youtube.com/watch?v=Px_qiUXL9Og