aged males that failed to mate had lower body weight , a lower hematocrit , hypertrophied adrenal glands and seminal vesicles , decreased fructose levels in seminal vesicle fluid , atrophied testes with fewer sperm that were less motile , lower testosterone levels , and a greater percentage of degenerating epithelium lining seminiferous tubules .
C0037868
sperm
C0036630
seminiferous tubules