關(guān)于消化系統(tǒng)的英文

1、The Digestive System(also called the gastrointestinal or alimentary canal),,The primary functions,IngestionDigestionAbsorptionElimination,Introduction,Anatomically, the digestive system consist of a 30-foot long, mu

2、cous membrane-lined tube beginning with mouth and ending with the anus,The digestive system,,MouthPharynxEsophagusStomachSmall intestineLarge intestineLiverGallbladderPancreas,,Accessory organs of the digestive s

3、ystem,The oral cavity,,The teethThe tongueThe palate,,Chewing and swallowing,The teeth are used to cut ,tear and crush food into smaller pieces. Each tooth consists of pulp, cementum and enamel.The teeth are class

4、ified incisors , cuspids and molars.The tongue manipulates food in the mouth during mastication and deglutition.The palate the hard plate and the soft plate (the uvula hanging from the soft plate),,,,,,The pharynx

5、 or throat ,is a long muscular tube that serves as a passageway for food from the mouth to the esophagus and as a passway for air from nose to the windpipe.The esophagus is a long muscular tube extending from t

6、he pharynx to the stomach .Food is propelled by rhythmic contractions of muscles in the wall of the esophagus. This process is called peristalsis.,,The stomach It is composed of an upper portion called fund

7、us,a middle section known as the body and a lower portion, called the antrum. The cardiac sphincter relaxes and contracts to move food from the esophagus into the stomach ,whereas the pyloric sphincter allows foo

8、d to leave the stomach when it sufficiently digested. As the stomach fills ,the rugae unfolded, exposing the digestive glands and stimulating them to secret digestive enzymes and hydrochloric acid. The

9、se substances help transform food present to a semifluid substance.,,,,The small intestine is the region of the gut where nearly all of the chemical digestion of the nutrition components of food take place.It divided in

10、to 3 sections:1)the duodenum 2)the jejunum 3)the ileum In the wall of the entire small intestine are millions of villi. It is through the capillaries in the villi that completely digested nutrients pass into the bloodst

11、ream and lymph vessels.,The large intestine is divided into 4 parts :cecum, colon,sigmoid colon,and rectum.,The cecum is connected to the small intestine by the ileocecal valve.The colon has 3 divisions : the ascending

12、colon, the transverse colon, the sigmoid colon. As fluid waste from the small intestine pass through various sections of the colon ,water is reabsorbed into body.The rectum serves as a reservoir for feces.,,,The liver:l

13、ocated in the upper right quadrant of abdomen,produces bile.Besides producing bile,it has several other vital functions.It manufactures blood proteins,destorys old erythrocytes and releases bilirubin,removes poisons(deto

14、xification） from the blood,stores and releases glycogen needed by the body.,,,The gallbladder：a pear-shaped sac behind the lower portion of the liver,stores bile,which is continuously secreted by the hepatic cells betwee

15、n meals.,,,,The pancreas:behind the stomach,manufactures digestive juice containing enzyme(amylase and lipase)that aid in the digestion of proteins,starches and fats.It also secretes insulin and glucagon.,,,,,Thank you,M