2007-01-25 14:45:58 · 10 answers · asked by aquabatslad 2 in Pregnancy & Parenting ➔ Other - Pregnancy & Parenting
totally a guess on my part, but I reckon they don't do much
breathing. maybe related?
2007-01-25 14:59:38 · answer #1 · answered by farmer 4 · 0⤊ 0⤋
I'm not sure exactly. But I do know that pulmonary circulation is circulation within to lungs toward the heart. Since the human fetus will not be breathing in air, it seems that it would be reduced.
2007-01-25 15:00:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Actually the pulmonary circulation is not said to be reduced but is still under developing condition and is not functioning . The very essence of pulmonary circulation is to oxygenate the deoxygenated blood from the fresh air we inhale. But as the foetus is inside the mother's womb,there is no communication between the growing foetus and external environment. And as such there could be no air which is inhaled and with more oxygen content.So the maternal blood vessels themselves supply the foetus...
2007-01-25 15:17:00 · answer #3 · answered by DON 1 · 1⤊ 0⤋
The fetus is not oxygenating its own blood with its lungs. The oxygenated blood is being pumped to the fetus' body via the umbilical cord, from the mother. The venous blood then returns to the mother's body, via the umbilical cord, where it is reoxygenated. T
herefore, the fetus needs only enough circulation to the lungs to keep the tissue healthy and oxygenated; the lungs aren't doing any work yet.
2007-01-25 15:05:05 · answer #4 · answered by Anonymous · 2⤊ 0⤋
Circulation through the lungs is not needed as the lungs are not functioning. During birth the umbilical connection is lost, the lungs take in oxygen and blood is routed there for oxygenation.
2007-01-25 15:00:25 · answer #5 · answered by Huggles-the-wise 5 · 0⤊ 0⤋
The fetus gets oxygenated blood from the mom's placenta. The lungs do not need to absorb oxygen. Less need for blood supply.
2007-01-25 14:59:55 · answer #6 · answered by ignoramus 7 · 0⤊ 0⤋
while the baby is inside the mother's belly, the mother is doing all the work for the fetus...that is why
2007-01-25 15:01:14 · answer #7 · answered by ? 1 · 0⤊ 0⤋
because its a human fetus
2007-01-29 08:07:54 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Because the mothers hart is doing most of the work.
2007-01-25 14:59:28 · answer #9 · answered by brp_13 4 · 0⤊ 1⤋
The only answer I can give you is because "that is how God plan the fetus to be."
2007-01-25 14:59:05 · answer #10 · answered by Anonymous · 0⤊ 3⤋