Final answer:
Erectile dysfunction can be caused by disruption of hormonal secretion from the testes, pituitary gland, and hypothalamus in the male reproductive system.
Explanation:
Erectile dysfunction (ED) can be caused by disruption of hormonal secretion from all options provided - the testes, the pituitary gland, and the hypothalamus. In the male reproductive system, hormones like testosterone play a crucial role in maintaining normal sexual function and spermatogenesis. The interplay between the hypothalamus, pituitary gland, and Leydig cells in the testes regulates testosterone production, which is essential for male reproductive health.
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