问题 问答题 简答题

说明LH,FSH的生理作用及在脑垂体中二者的含量和比例与发情特点的关系?

答案

参考答案:

FSH促进卵巢乱跑的生长;促进卵泡颗粒细胞的增生和雌激素合成和分泌,刺激卵泡细胞上LH受体产生;促进睾丸足细胞合成和分泌雄激素,刺激生精上皮的发育和精子发生(在次级精母细胞及以前阶段,FSH起重要作用,此后睾酮起主要作用)。LH生理作用:在雌性动物,LH,促进卵泡的成熟和排卵;刺激卵泡内膜细胞产生雄激素(为颗粒细胞合成雌激素提供前提物质);促进排卵后的颗粒细胞黄体化,维持黄体细胞分泌孕酮。在雄性动物,LH刺激睾丸间质细胞合成和分泌睾酮,促进附性腺的发运和精子最后的成熟。

完形填空
完形填空。阅读下列短文,从每小题所给的A、B、C、D四个选项中选出最佳选项。
    I'm taking my family to other countries to have a trip. We are going by train   1   New York, and then take a
ship to Europe. When we   2   in Europe, we're going to some countries for sightseeing (观光). We'll go to
places   3   by train or by bus. We are planning to fly home.
    It   4   us a long time to decide where to go, but I think we have planned a very   5   trip. We will go to
England, France and Italy. My wife is very interested in   6   to France because she is a teacher of French. And
my brother is looking   7   to a trip to Italy because he speaks Italian very well.
    We also   8   about how we would go to Europe. At first we wanted to fly because it would be   9   and
would save more time. But my brother likes to take a boat trip and the children  10   that, too. What do you
think of my trip?
( ) 1. A. to      
(     ) 2. A. got     
(     ) 3. A. also    
(     ) 4. A. paid    
(     ) 5. A. pleasure
(     ) 6. A. looking 
( ) 7. A. forward 
(     ) 8. A. spoke   
(     ) 9. A. faster  
(     ) 10. A. have    
B. for         
B. reach       
B. too         
B. took        
B. interested     
B. going       
B. after       
B. told        
B. fast        
B. liked     
C. in         
C. arrive     
C. either     
C. spent      
C. interest        
C. coming     
C. over       
C. said       
C. quickly    
C. enjoy    
D. at             
D. get            
D. neither        
D. cost           
D. interesting    
D. seeing         
D. for          
D. talked         
D. more quickly   
D. enjoyed      
选择题