the placenta
placenta
placenta
The Placenta
The umbilical cord supplies the fetus' oxygen.
The organ where the developing fetus resides is called the uterus. This is where the fetus grows and matures inside the female.
Fetus
The heart is the first organ to develop in a fetus. Together, blood and the circulatory system, that is powered by the heart, form the first organ system.
Placenta
Placenta
The lungs
The lungs of the mother breath in the air. The lungs put the oxygen in the red blood cells. The blood flows through the walls of the uterus and through the umbilical cord into the blood stream of the fetus. The venus blood supply returns through a vein in the cord back into the mother and the lungs and the cycle repeats until the cord is cut.
fetus
The Heart.