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oxygen causes it. lungs start to function.

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Q: Why does the ductus arteriosis close off after birth?
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Why does the arteriosus close off at birth?

The ductus arteriosus allows blood to pass around the lungs while the baby is in utero. After birth, it closes off so the lungs can oxygenate the blood.


Why does the ductus arteriosus close off at birth?

Well, the primary factor regarding its closure is Oxygen. In addition to that, it is thought that the lungs secrete bradykinin and prostaglandins after birth (once they begin functioning). This then induces the constriction of the smooth muscle in the Tunica media (and probably tunica intima) of the ductus arteriosus. With the constriction, it usually closes within 1-2 days.


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They rip hair off and coat the nest with it. Then they will give birth. Sometimes, though, they have a false pregnancy when they are close to male hormones and pretend they are pregnant. Within a week of building the nest they will usually give birth if they are, in fact, pregnant.


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The museum can close because it is bankrupt and not an off people


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In order to close it, you have to pay off the overdraft first.


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