Anatomy of Alimentary Tract

The alimentary tract is a musculomembraneous canal about 8½ metres in length. It extends from the oral cavity to the anus. It consists of the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The liver with gallbladder and pancreas are the large glands of the alimentary tract.

The first division of the alimentary tract is formed by the mouth. Important structures of the mouth are the teeth and the tongue, which is the organ of taste. The soft and hard palates and the salivary glands are also in the oral cavity.

From the mouth food passes through the pharynx to the esophagus and then to the stomach.

The stomach is a muscular, hollow, dilated portion of the alimentary canal. It is in the upper part of the abdomen under the diaphragm. It measures about 21-25 cm in length, 8-9 cm in its greatest diameter. It has a capacity of from 2.14 to 4.28 litres.

The small intestine is a thin-walled muscular tube about 6.5 metres long. It is located in the middle portion of the abdominal cavity. The small intestine is composed of the duodenum, jejunum and ileum.

The large intestine is the last part of the alimentary tract. Its function is to absorb water from the remaining indigestible food matter, and then to pass useless waste material from the body. It is about 1.5 metres long. It is divided into caecum, colon and rectum.

The liver is the largest gland in the human body. It is in the right upper part of the abdominal cavity under the diaphragm. The weight of the liver is 1,500 g. This organ plays a major role in metabolism and has a number of functions in the body, including glycogen storage, decomposition of red blood cells, plasma protein synthesis, hormone production, and detoxification.

The gallbladder is a hollow sac lying on the lower surface of the liver, where bile is stored, before it is released into the small intestine.

The pancreas is a long thin gland lying behind the stomach.

Exercise 6. Answer the questions to the text:

1. What is the alimentary tract?

2. What does the alimentary tract consist of?

3. What is the 1^st division of the alimentary tract formed by?

4. What is the stomach?

5. What is the small intestine?

6. What is the function of the large intestine?

7. What largest glands in the human body do you know?

8. What is the function of the gallbladder?

Exercise 7. Translate the following word combinations into English:

Травний тракт, глотка та стравохід, черевна порожнина, простягатися від порожнини рота до ануса, під діафрагмою, мати ємкість, тонкостінна м'язова трубка, середня частина черевної порожнини, дванадцятипала та порожниста кишки, найбільша залоза в тілі людини, залишки неперетравленої їжі, ряд функцій в організмі, розкладання еритроцитів, тонка довга залоза, відігравати важливу роль в обміні речовин, товста та пряма кишки.

Exercise 8. Match the terms with their definitions:

Exercise 9. Write down organs in their appropriate position:

Stomach

caecum

colon

appendix

liver

teeth

esophagus

rectum

gallbladder

epiglottis

tongue

soft palate

pancreas

ileum

rectum

anus

salivary glands

Exercise 10. Say what organ is spoken about:

I. This organ is the largest gland in the human body. It is in the upper part of the abdominal cavity under the diaphragm in the right side of the abdomen. Its upper surface is convex. This organ consists of small lobules connected together by connective tissue, different vessels and nerves.

II. This organ is pyriform (грушевидный) in shape. It is a dilated portion of the alimentary canal. It is in the upper part of the abdomen under the diaphragm. The liver is above this organ, and the colon is below it. The pancreas is behind this organ.

III. It is the beginning of the alimentary tract and the digestion starts here when taking the first bite of food. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.

IV. This organ is the portion of the alimentary tract that is located between the stomach and rectum. In the human being it is divided in to two parts. Its function is to digest food and to enable the nutrients released from that food to enter into the bloodstream.

V. It is a tubular organ that lies behind the trachea and heart and in front of the spinal colomn; it passes through the diaphragm before entering the stomach.

VI. This organ is a part of two different systems of the body, digestive system and respiratory system. It is a passageway leading from the mouth and nose to the esophagus and larynx.

VII. This is a long, narrow gland that is located across the upper abdomen, behind the stomach and the spleen. It produces important digestive enzymes and hormone called insulin.

VIII. This is a hollow organ located beneath the right lobe of the liver and measures 8 centimeters in length. Its function is to store bile.

IX. This is a thin cartilaginous flap that covers the entrance to the larynx during swallowing, preventing food from entering the trachea.

X. It is the last part of the digestive system. Water is absorbed here and the remaining waste material is stored as feces before being removed by defecation.

Exercise 11. Fill in prepositions from the box below where necessary and translate into your native language:

One of the most common locations ____ a foreign body is the alimentary tract.

It is possible ___ foreign bodies to enter the tract from the mouth, or from the rectum.

The objects most commonly swallowed ____ children are coins. Meat impaction is more common ____ adults.

Swallowed objects are more likely to lodge ____ the esophagus or stomach than ____ the pharynx or duodenum.

____ the person who swallowed the foreign body is doing well, usually a x-ray image will be taken. It will show any metal objects, and should be repeated a few days later to confirm that the object has passed all the way _____ the alimentary tract. Also it needs to be confirmed that the object is not stuck _____ the airways, in the bronchial tree.

Most objects that are swallowed will pass all the way ____ the gastrointestinal tract unaided.

____ the foreign body causes problems like pain, vomiting ____ bleeding it must be removed.

Exercise 12. Arrange the following sentences in a correct order to describe the following term “stomach”:

1. The stomach has three tasks in digestion: mixing foods with gastric juices, storing swallowed food and liquid, moving food into the small intestine.

2. It is located in the upper part of the abdomen under the diaphragm.

3. The stomach is a hollow, saclike organ enclosed in a muscular wall.

4. The stomach receives food from the esophagus.

5. These flexible muscles allow the stomach to extend when you eat.

6. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter.

Exercise 13. Continue the following sentences using the text to describe the following term “intestine”:

1. Intestine is the last part of the alimentary tract and consist of ….. and …...

2. The small intestine is composed of ….., ….., …...

3. The large intestine is divided into ….., ….. and …...

4. The function of intestine is ….. and then …...

Exercise 14. Translate word-combinations with Participle into your native language:

Saliva moistening the food; disease, spreading rapidly; food, containing a lot of vitamins; organ playing an important role; blood containing digested nutrients; teeth grinding the food; patient suffering from different diseases; tract extending from the mouth to the anus; food matters remaining indigestible; walls of the intestine absorbing water.

Exercise 15. Join two parts of the sentences and translate:

Exercise 16. Put questions to the underlined words:

1. First step in the digestive system take place in the mouth.

2. The soft palate is a continuation of the soft tissues covering the hart palate.

3.The weight of the largest of the salivary glands is 28gr.

4. The shape of the stomach changes when it dilates.

5. The duodenum is called so because its length measures about the length of twelve fingers.

6. The liver consisting of lobes is covered with a fibrous coat.

7. Foreign body that enters the alimentary tract can cause different problems.

8. Gastroendoscopy shows all the damages in the stomach.

Exercise 17. Open the brackets using the verb in the appropriate form:

1. The mechanical digestion of the food (to start) by the action of mastication and the wetting contact of saliva.

2. The esophagus (to line) with smooth muscle, which forces the food down the pipe to the stomach.

3. When food is swallowed, the stomach (to produce) hydrochloric acid.

4. The shape of the stomach (to change) when it delates and its borders greatly extend.

5. The liver (to play) a major role in metabolism and (to have) a number of functions in the body.

6. Discharged from the liver bile (to store) in the gallbladder.

7. 95% of absorption of nutrients (to occur) in the small intestine.

8. Waste material (to eliminate) from the rectum during defecation.

Завдання для самостійної роботи студентів (СРС)

Exercise 1. Topical vocabulary:

Exercise 2. Make nouns from the verbs with the help of suffix -tion and translate into your native language:

to absorb, to product, to masticate, to create, to excrete, to digest, to stimulate, to salivate, to activate, to distribute, to penetrate, to irritate, to inhale.

Exercise 3. Some of the following words don’t form adjectives with the help of suffixes. Try to form adjectives from the given nouns and translate them:

Exercise 4. Combine the adjectives with the proper nouns given below. Translate your word combinations:

Adjectives: inner, serous, salivary, hard, exact, vital, connective, pale;

Nouns: length, palate, coat, capacity, tissue, gland, layer, face.

Date: 2015-12-12; view: 2660; Нарушение авторских прав