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32. What is haemoblastosis? What factors can provoke it?

Haemoblastosis is proliferation of haemopoietic tissue, which can be diffuse or focal; it’s disease of the whole blood system characterized by:

  • Hyperplasia of the cell in the haemopoitic organs

  • Dominating of pathological cells under normal cells of the haemopoietic organs

  • Development of pathological cells of haemopoiesis in various organs

It’s rather rare disease. There are some factor which can provoke haemoblastosis and growth of tumer – concerigenic substance and radition.

33. What are the main theories explaining the etiology of haemoblastosis?

There are two theories of the etiology of haemoblastosis and tumors.

Virus theory – nowadays more than 20 viruses which can cause haemoblastosis in animals, were isolated, but attempt to isolate the virus of the main form haemoblastosis in man failed.

Genetic theory – according to it, haemoblastosis develops due to congenital or acquired damage of the chromosome structures. Also the newest one- the clone theory according to which haemoblastosis arise due to primary chromosome mutation in one of the haemopoietic cells.

Gastrointestinal diseases

34. What does the digestive system consist of?

The digestive system consists of the organs and glands responsible for the ingestion (or swallowing) and digestion the food. The gastrointestinal tract begins with mouth (oral cavity). It contains 32 teeth, tongue, two gums (upper and lower ), soft and hard palate and salivary glands. There is throat, esophagus, stomach (fundus, body, antrum\ cardiac sphincter ( between esophagus and stomach) and pyloric sphincter ( between stomach and small intestinal), small intestinal (duodenum, jejunum and ileum), large intestinal (caecum with appendix, colon (ascending, transverse, descending and sigmoid) and rectum). The terminal part of the digestive tract is anus (internal and external sphincter)

Glands : salivary glands, gastric glands (- produce gastric juice ), pancreas and liver ( the largest gland of the body)

35. Describe the process of digestion?

In the oral cavity the food crushed by the teeth, mixed with the help of the tongue and moistened with the help of saliva – the bolus is formed and swallowed with the help of pharynx. The bolus moves down the esophagus to the stomach ( through the cardiac sphincter). In the stomach the food is broken down with the help of hydrochloric acid, pepsin and enzymes by wave-like movements of the stomach. Through the pyloric sphincter the food goes from stomach to the duodenum, where it ‘s digestion continuous with the help of bile and pancreatic juice. In small intestine absorbs nutrients and water and in large intestine absorbs also water and some ions. The rectum is depot for the wastes, which are eliminated through the anus.

36. What the principle function of the gastrointestinal tract?

The functions of gastrointestinal tract are:

  • To convert complex of food into simple substance, that may be absorbed into the blood stream for the nourishment of the body

  • To transport the products of digestion to the point of their absorption into the blood and to the point of the removal of wastes from the body.

  • To excrete the wastes materials

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