Download L11 Fetal Circulation

L11 Fetal System vs. Adult System
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Heart develops in the 3rd and
4th weeks in uterus
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 8 week the organ systems are
functioning (eg. The heart)
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 The 4 month the fetal heart
beat is loud enough to hear
 Fetal system is not the same as
the adult system
 
L11 What is the Fetal System different?
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The fetus is unable to breath
air In the womb, therefore
sending the blood to the lungs
is pointless.
 The fetus must get nutrients
from the mother as well let
her take care of its waste
 
L11
4 Features not Present in Adults!
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1. Oval Opening: foramen ovale
  Opening
between the two atria,
covered by a flap that acts like a
valve
  bypasses the pulmonary circuit.
If it doesn‘t close after birth=blue
babies, from a mixing of blood and
they need open heart surgery
L11 4 Features not Present in Adults!
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2.  Arterial Duct: ductus arteriosus
  Connects
pulmonary artery and
aorta.
  The arterial duct s function is to
bypass the pulmonary circuit.
L11 4 Features not Present in Adults!
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3.  Umbilical Arteries and Veins
  Vessels
that travel to and from
the placenta. Exchange of gases,
nutrients and waste with the
mother.
4 Features not Present in Adults!
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4.  Venous Duct: ductus venosus
  Connects
umbilical vein to the
vena cava
  it attaches right at the baby s
liver, but bypasses most of the
liver.
Ductus venosus
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L11 Fetal Circulation Assignment
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Draw a schematic (simplified version) of the
following two circulatory systems and include. 1.
blood flow arrows. 2. All of the listed parts.
  1. Adult circulation: heart, aorta, body, liver, lungs,
vena cava, p artery, p vein
 
2. Fetal circulation: heart, aorta, body, liver, lungs,
vena cava, p artery, p vein, umbilical artery,
umbilical vein, forum ovale, ductus arteriosis, venus
ductus.
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  See pg 311-314 BC Bio Add to summary 5 thing
 
L11 eg. Adult....schematic
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