Q:

After birth, all of the following vessels constrict EXCEPT:

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After birth, all of the following vessels constrict EXCEPT: 


  1. Ductus arteriosus.
  2. Umbilical arteries.
  3. Ductus venosus.
  4. Hepatic portal vein.
  5. Umbilical vein.

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D. Hepatic portal vein.

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