the results clearly demonstrate that aging reduces ( p less than 0.01 ) the hypothalamic content of gonadotrophin releasing hormone ( gnrh ) , decreases the capacity of the pituitary ( p less than 0.01 ) to synthesize and or release follicle stimulating hormone and luteinizing hormone ( lh ) following a single stimulation of gnrh ( 50 ng/100 g body weight ) , lowers the capacity of the testes to produce testosterone ( p less than 0.01 ) following multiple subcutaneous injections of human chorionic gonadotrophin ( hcg 3iu/100 g body weight for 3 consecutive days ) , decreases the number of leydig cell lh receptors and decreases the in vitro responsiveness of the hcg-challenged leydig cell to synthesize testosterone ( p less than 0.01 ) .
C0018061
gonadotrophin
C0733758
follicle stimulating hormone