咀嚼和吞咽 Mastication and swallowing Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display Hard palate Soft palate Spigot Glottis Esophaou sphincter The swallowing reflex is coordinated by the medulla oblongata, which stimulates the appropriate sequence of contraction and relaxation in the participating skeletal muscle, sphincters, and smooth muscle groups
咀嚼和吞咽 Mastication and swallowing The swallowing reflex is coordinated by the medulla oblongata, which stimulates the appropriate sequence of contraction and relaxation in the participating skeletal muscle, sphincters, and smooth muscle groups
Copyright e The McGraw-Hill Companies, Inc. Permission required for reproduction or display U esophageal The coordinated sequence of contraction and relaxation in the upper esophagea sphincter, the esophagus, and the lower esophageal sphincter is necessary to deliver swallowed food to the stomach
The coordinated sequence of contraction and relaxation in the upper esophageal sphincter, the esophagus, and the lower esophageal sphincter is necessary to deliver swallowed food to the stomach
胃内消化 胃的主要功能: Fund 暂时储存食物 Esophagus 消化食物 Lower esophageal 少量吸收 sphincter Body (secretes mucus, pepsinogen, and HCi Duodenum Antrum (secretes Pyloric mucus, sphincter pepsinogen and gastrin)
胃内消化 • 胃的主要功能： – 暂时储存食物 – 消化食物 – 少量吸收
Vagal trunks Anterior left Posterior right Mucus Lower oesophageal Alkali-secreting region sphincter Fundus Greater Lesser curvature curvature Corpus Pyloric antrum Acid-secreting Pylorus region Duodenum
胃液 Gastric juice成分 HCl 胃蛋白酶原 Pepsinogen 黏液Muus 碳酸氢盐HCO3 内因子 Intrinsic factor pH0.91.5
• 胃液Gastric juice成分 – HCl – 胃蛋白酶原Pepsinogen – 黏液Mucus – 碳酸氢盐HCO3 - – 内因子Intrinsic factor • pH 0.9-1.5