Pregunta:
Piece of info
Autor: tera toniRespuesta:
Blood from the baby flows continuously to and from placenta through umbilical cord. In the placenta, baby's blood comes very close to mother's blood so substances pass between mother and baby by diffusion and active transport.
0 / 5 (0 calificaciones)
1 answer(s) in total
Autor
tera toni