1、消化系统的组成和构造 口腔、咽 消化管」食道、 小肠(十二指肠、空肠、回肠) 大肠(盲肠、结肠、直肠) 消化系统 唾液腺 胰腺}大型消化腺 消化腺 肝脏 胃腺、肠腺(小型消化腺)
1、消化系统的组成和构造 二、人的消化系统 消化系统 消化管 消化腺 口腔、咽、 食道、胃 小 肠(十二指肠、空肠、回肠) 大 肠(盲肠、结肠、直肠) 胰 腺 肝 脏 唾液腺 胃腺、肠腺 大型消化腺 (小型消化腺)
1、人的消化系统的组成与构造 pral cavity Parotid gland Sublingual rland auLIc Alori porton at call bladder leun Duodenum a Figure 37.9 The human digestive system. Food gus and into the stomach, where hours. In 12-24 hours, any undigested enters the system through the mouth 2-6 hours being partially digested material passes through the large intes where it is chewed for some seconds digestion and nutrient absorption tne, and feces are expelled through th before being swallowed. Food takes the small intestine over a period of 5-6 5-10 seconds to pass down the esopha
1、人的消化系统的组成与构造
组成和构造 A.消化管 口腔(caν um oris):牙齿、舌、唾液腺(3对)开口 适于吸吮、咀嚼、感受味觉及语言等复杂功能。 食道( esophagus:无消化吸收的功能,是食物从口入胃的通道。 胃( stomach):肌肉质的囊,将食团压碎、搅拌。 胃腺分汹粘液和胃液(盐酸和胃蛋白酶的混合物) 将食物初步消化。 小肠( small intestine):消化管最长的部分,分十三指肠、空肠和回肠。 是消化和吸收的主要器官 胆总管和胰管的末端开口于十二指肠 组织形态结构特征:有小肠绒毛、微绒毛 大肠 (intestinum crassur)盲肠、结肠(升、橫、降结肠)、直肠。 主要功能是回收水分,排除体内过剩的钙盐和铁盐
A .消化管 口腔(cavum oris):牙齿、舌、唾液腺(3对)开口 适于吸吮、咀嚼、感受味觉及语言等复杂功能。 食道(esophagus): 无消化吸收的功能,是食物从口入胃的通道。 胃(stomach): 肌肉质的囊,将食团压碎、搅拌。 胃腺分泌粘液和胃液(盐酸和胃蛋白酶的混合物) 将食物初步消化。 小肠(small intestine):消化管最长的部分,分十二指肠、空肠和回肠。 是消化和吸收的主要器官. 胆总管和胰管的末端开口于十二指肠 组织形态结构特征:有小肠绒毛、微绒毛 大肠(intestinum crassum) 盲肠、结肠(升、横、降结肠)、直肠。 主要功能是回收水分, 排除体内过剩的钙盐和铁盐. 1、消化系统的组成和构造
1、峭化糸统的组成与构造 A.消化管 (1)口腔、食道 containing nerves and blood vessels. The actual chewing surtace Is a hard enamel layered over the softer dentin, which forms the body of the tooth FIGURE 48.9 The human pharynx, palate, and larynx. Food that enters the pharynx is prevented from entering the nasal cavity by elevation of the soft palate, and is prevented from entering the larynx and trachea(the airways of the respiratory system) by elevation of the larynx against the
1、消化系统的组成与构造 A. 消化管 (1) 口腔、食道
食道与蠕动 Relaxed- Relaxed -Circular muscles The Esophagus and peristalsis contrate onstncting Bol LX and四s bolus down Longitudinal muscles Epiglottis shortening Passageway ahead of bolus Figure 37.11 Relaxed Peristalsis. Waves of muscular contraction move the bolus of food down the esophagus to the stomach Contracted muscles FIGURE 48.10 The esophagus and peristalsis. After food has entered the Stomach esophagus, rhythmic waves of muscular contraction, called peristalsis, move the food down to the stomach
食道与蠕动 The Esophagus and peristalsis