生理简答题（Physiological simple answer）.docVIP

生理简答题（Physiological simple answer） 18 simple answers to physiology First, the main components of gastric juice, the extremely role Answer: 1. main ingredients: hydrochloric acid, stomach protein, enzyme, mucus and internal factor 2. hydrochloric acid: (1) protein, and zymogen activation in gastric pepsin provides acidic PH activities as required; (2) sterilization (3) protein denaturation, conducive to digestion; (4) promote the secretion of pancreatic juice, bile and intestinal fluid; (5) to promote intestinal absorption of calcium and iron etc.. The action of pepsin: the activation of hydrochloric acid into pepsin, which is active and breaks down proteins in food. Mucus action: mucus forms gel layer on the surface of gastric mucosa, which can lubricate food and protect gastric mucosa Internal factor: an internal factor that combines vitamin B12 and a complex to protect B12 from intestinal hydrolytic enzymes. Two. Why is the small intestine the main place for digestion and absorption? Answer: 1., small intestine length is long, mucous membrane has cricoid fold, have a large number of fluff and microvilli, have huge absorption area. 2. food stays longer in the small intestine (3-8 hours)..3. food has been digested in the small intestine as a small molecule suitable for absorption. There are 4. internal intestinal villi capillary, lymphatic capillary and smooth muscle fibers and nerve fiber network structure is rich, eating can cause the villi to produce flexible and swing rhythm, can accelerate the villous blood and lymph flow, help to absorb. Three. The influence factors of glomerular filtration rate Answer: 1. effective filtration pressure = glomerular capillary - (plasma colloid osmotic pressure + capsular pressure), is the power of glomerular filtration function, constitute any three factors of effective filtration pressure factors change, influence the glomerular filtration rate, relative to other conditions unchanged, glomerular capillary pressure on glomerula