F_706816_2010-01-07 - Question 1(25 points A 22-year-old...

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Question 1 (25 points) A 22-year-old man came to his physician as a part of investigation of the cause of infertility of his marriage of two years. Physical examination revealed a healthy young man with normal secondary sex characteristics but without testes in the scrotal sac. Examination of a specimen of semen failed to demonstrate the presence of spermatozoa. The laboratory values were as follows: Urinary gonadotrophins 12 RU/24 hours (normal) Plasma testosterone 7 pg/L At surgery the testes were found in the inguinal canals. Histologic examination of biopsy material showed fibrosis and degeneration of the epithelium of the seminiferous tubules. 2. What factors control FSH secretion in the male? FSH secretion is stimulated by GnRH, and suppressed by testosterone through a negative feedback system. FSH hypothlamus testosterone Answer: Save answer Question 2 (25 points) A 22-year-old man came to his physician as a part of investigation of the cause of infertility of his marriage of two years. Physical examination revealed a healthy young
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F_706816_2010-01-07 - Question 1(25 points A 22-year-old...

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