III-2.posterior heart

III-1.opened heart

III-8.heart.foramen.oval.LA

III-6.fetal circ

III-3.heart.ductus.arterios

III-7.heart.foramen.oval.RA

III-5.upper circ

III-4.lower circulatory

heart valves

Fig 22-5.flash

1701.heart pul vessels

Fig 22-5.low flash