um)
The oesophagus is a muscular tube, about 25cm long, with a sphincter (valve) at each end. Its function is to transport food and fluid, after being swallowed, from the mouth to the stomach. No absorption of nutrients takes place in the oesophagus. A mouthful of food which has been chewed and swallowed is called a bolus. This is propelled from the pharynx (throat) into the oesophagus, and is swept towards the stomach in peristaltic waves. These muscular contractions are involuntary, and cannot normally be felt. When food is not passing through, the oesophagus is folded in, or collapsed.
动物的消化系统
制作人: 周侠敏 张萌 周静雯
Digestive System
横隔膜 (Diaphragm)
肝脏 (Liver) 胆囊 (Gallbladder)
结肠 (Colon)
盲肠 (Calcum) 阑尾 (Appendix)
食管(Oesophagus) 脾(Spleen) 胃(Stomach) 胰腺 (Pancreas)