Once the lungs begin to function, t

Once the lungs begin to function, the ductus arteriosus shuts off due to contractions of smooth muscle in its wall, and it becomes the ligamentum arteriosum.
The muscle contraction is probably mediated by the polypeptide bradykinin, released from the lungs during their initial inflation.
The ductus arteriosus generally does not close completely until about 3 months after birth.
Prolonged incomplete closure results in a condition called patent ductus arteriosus.

Hasil (Bahasa Indonesia) 1:

Setelah paru-paru mulai berfungsi, ductus arteriosus menutup karena kontraksi otot polos dalam dinding yang, dan itu menjadi ligamentum arteriosum. Kontraksi otot mungkin dimediasi oleh bradikinin polipeptida, dilepaskan dari paru-paru semasa inflasi awal mereka. Ductus arteriosus umumnya tidak menutup sepenuhnya sampai sekitar 3 bulan setelah melahirkan. Berkepanjangan mengakibatkan penutupan lengkap kondisi yang disebut patent ductus arteriosus.