Fetal Blood Circulation

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2. In Human, an unborn baby that
develops and grows inside the uterus (womb).
∙ The fetal period
begins “8 weeks”after the
fertilization of an egg by
sperm and ends at the
time of birth.
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3. The heart of fetus consist of 4 chamber:
1. Right Atrium
2. Right Ventricle
3. Left Atrium
4. Left Ventricle
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1. Placenta removed
2. Lungs take in air
• Wharton’s jelly ⇒ temperature fall ⇒ start construction ⇒
resistance↑ ⇒blood clot in umbilical vein ⇒ close ductus Venosus.
• Air sac of lungs replace air by fluid ⇒ fluid move in capillaries ⇒
Oxygen ↑ ⇒ resistance ↓ ⇒blood move through lungs to left
atrium.
• Construction of smooth muscle in ductus arteriosus ⇒ sense
oxygen ↑ ⇒ prostaglandin ↓ due to placental removal ⇒
construction of muscle ⇒ close ductus arteriosus. Low resistance
in aorata ⇒ high resistance in umbilical artery ⇒ blood do not
move into umbilical artery
• High pressure in pulmonary vein ⇒ close foramen ovale

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9. Questions ?
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