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ANA 201 > Fetal Circulation > Flashcards

Fetal Circulation Flashcards

1
Q

All the capillaries and vessels are formed in

A

The 4th week

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2
Q

Umbilical arteries

A

Are arteries that carries deoxygenated blood from the fetus to the placenta

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3
Q

Umbilical veins

A

carries oxygenated from the placenta to the fetus

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4
Q

There are three shunts

A

Ductus venosus
Ductus arteriosus
Foramen ovale

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5
Q

The Ductus venosus

A

Shunts the umbilical veins away from the liver into the inferior vena cava.

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6
Q

Ductus arteriosus

A

Shunts the pulmonary trunk(artery) away from the lungs into the umbilical arteries

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7
Q

Foramen ovale

A

Shunts blood from the right atrium to the left atrium

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8
Q

Blood pressure In the umbilical vein

A

15-20mmHg

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9
Q

In the fetal lung

A

There is high respiratory resistance

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10
Q

The lungs is

A

Filled with fluids which is responsible for the high respiratory resistance

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11
Q

Ductus arteriosus after birth

A

Becomes ligamentum arteriosus

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12
Q

Ductus venosus after birth becomes

A

Ligamentum venosus

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13
Q

Foramen ovale after birth becomes

A

Fossa ovalis

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14
Q

Functional closure of the ductus venosus is

A

Immediately after birth

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15
Q

Structural closure of ductus venosus occurs

A

3-7 days after birth

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16
Q

Closure of ductus venosus is due to

A

Unknown cause
It is the strong contraction of the wall of the ductus venosus

17
Q

Closure of the ductus arteriosus is due to

A

Contraction of the smooth muscle in its wall caused by reverse flow of blood into the pulmonary trunk.
This is caused by increased oxygen availability.

18
Q

The events that happened after birth

A

Umbilical arteries becomes umbilical ligaments
Umbilical vein becomes ligamentum teres
Blood pressure In the right side reduces
Blood pressure in the left side increases
Lungs replaces placenta as the respiratory resistance reduces
Oxygen increases to 100mmHg
Left part of the heart gets thicker than the right part

ANA 201 (6 decks)

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