<prompt> Which of the following is a function of cells Labelled A ?Secretion of FSH into the tubular lumenSecretion of testosterone into the tubular lumenMaintenance of the blood-testis barrierSynthesis of estrogen after puberty  <response>: Of course If you focus on the Picture without reading the options you cannot guess the Structure...SoWhenever you are not sure about the HISTOLOGY Picture, read the options and almost 99 you can get to know the structurePicture : Structure of Seminiferous tubule 