●●●●● 第五章消化与吸收生理 ●●●● ●●0 ●●● ●●●● (CHAPTER 5 DIGEstion ABSORPTION) Chapter Outline Overview of the gastrointestinal system Digestion in the mouth Digestion in the stomach Digestion in the small intestine Digestion in the large intestine Absorption 08:11:56 上一页下一页
08:11:56 消化 1 第五章 消化与吸收生理 （CHAPTER 5 DIGESTION & ABSORPTION） Chapter Outline ⚫ Overview of the gastrointestinal system ⚫ Digestion in the mouth ⚫ Digestion in the stomach ⚫ Digestion in the small intestine ⚫ Digestion in the large intestine ⚫ Absorption 上一页 下一页
●●●●● ●●●● ● ntroduction: ●●0 ●●● ●●●● The gastrointestinal system is consisted of the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine, and large intestine)and the accessory organs(salivary glands, liver, gallbladder, and pancreas) that secrete chemical substances into gastrointestinal tract via connecting ducts. The overall function of the gastrointestinal system is to process ingested foods into small molecules and then transfer them, along with salts and water, to the body's internal environment, where they can be distributed to cells 08:11:56 上一页下一页放映结束
08:11:56 消化 2 ⚫ Introduction: The gastrointestinal system is consisted of the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine, and large intestine) and the accessory organs (salivary glands, liver, gallbladder, and pancreas) that secrete chemical substances into gastrointestinal tract via connecting ducts. The overall function of the gastrointestinal system is to process ingested foods into small molecules and then transfer them, along with salts and water, to the body's internal environment, where they can be distributed to cells. 上一页 下一页 放映结束
●●●●● ●●●● ●●0 Simple Digestive System of Swine ●●●● 第 Small Intestine Colon /入 Rectum 概2 Cecum 述 Stomach Large Intest Pharynx 上一页下一页放映结束
08:11:56 消化 3 第一节概述 上一页 下一页 放映结束
、饲料在消化到内的变化: 1、消化( Digestion): Break down of food into small molecules ①机械消化( mechanical digestion) ②化学消化( chemical digestion) ③微生物消化 2、吸收( Absorption): Transfer of nutrients into the blood and lymph 上一页下一页放映结束
08:11:56 消化 4 一、饲料在消化到内的变化： 1、消化(Digestion): Break down of food into small molecules 。 ① 机械消化（mechanical digestion） ② 化学消化（chemical digestion） ③ 微生物消化 2、吸收(Absorption): Transfer of nutrients into the blood and lymph。 上一页 下一页 放映结束
二、消化道平滑肌的生理特性 ●●●●● ●●●● (Physiologic characteristics of smooth muscle of ●●0 ●●● digestion tract ●●●● (一)一般生理特性( Genera/ Characteristics) (1)伸展性( easy extension),胃可以容纳好几倍于自己原来初 容积的食物,而胃内压及胃壁的紧张性却没有多大改变。 (2)紧张性收缩:内脏平滑肌经常保持一种微弱持续的收缩状态,平 滑肌本身所固有的。 (3)自动节律性:收缩非常缓慢,持久。 (4)平滑肌对电刺激不敏感,但对化学的、温度的和机械牵张刺激较 敏感。( Sensitive to mechanical stretch, temperature and chemical stimuli: Insensitive to electrical stimuli (5)兴奋性较低,收缩缓慢。 08:11:56 上一页下一页放映结束
08:11:56 消化 5 二、消化道平滑肌的生理特性 （Physiologic characteristics of smooth muscle of digestion tract ） （一）一般生理特性（General Characteristics） (1) 伸展性（easy extension ） ，胃可以容纳好几倍于自己原来初 容积的食物，而胃内压及胃壁的紧张性却没有多大改变。 (2)紧张性收缩：内脏平滑肌经常保持一种微弱持续的收缩状态，平 滑肌本身所固有的。 (3)自动节律性： 收缩非常缓慢，持久。 （4）平滑肌对电刺激不敏感，但对化学的、温度的和机械牵张刺激较 敏感。（ Sensitive to mechanical stretch, temperature and chemical stimuli； Insensitive to electrical stimuli ） （5）兴奋性较低，收缩缓慢。 上一页 下一页 放映结束