( a ) acts at the Leydig cells and stimulates synthesis of androgens - which in turn, stimulate the process of spermatogenesis
( b ) acts at the Leydig cells
( c ) acts at the Leydig cells and stimulates synthesis and secretion of androgens - which in turn, stimulate the process of spermatogenesis
( d ) acts at the Leydig cells and stimulates secretion of androgens - which in turn, stimulate the process of spermatogenesis
