gastrointestinal system Stomach, loosely Lower esophageal sphincter Air in intestine Meconium(胎粪) · Glucuronyl transferase(葡萄糖醛酸转移酶)gastrointestinal system • Stomach, loosely Lower esophageal sphincter • Air in intestine • Meconium (胎粪） • Glucuronyl transferase (葡萄糖醛酸转移酶) N I CU