निम्नलिखित में से कौन सी संरचना जन्म के तुरंत बाद पहले कुछ मिनटों के भीतर कार्यात्मक रूप से बंद (functional closure) हो जाती है?

What is the expected target preductal oxygen saturation (SpO2) in a healthy full-term newborn at 1 minute of life?

A newborn is found to have a single umbilical artery (SUA). This finding is commonly associated with congenital anomalies in which organ system?