Describe the hormonal regulation of spermatogenesis
What will be an ideal response?
The hypothalamus secretes gonadotropin-releasing hormone (GnRH), which causes the anterior pituitary to release follicle-stimulating hormone (FSH). The FSH stimulates Sertoli cells in the testes to secrete androgen-binding protein (ABP), which binds testosterone and concentrates it in the seminiferous tubules where it stimulates spermatogenesis. As more sperm are produced, the Sertoli cells release more inhibin, which inhibits the release of FSH from the pituitary gland. With less FSH, the Sertoli cells secrete less ABP resulting in less spermatogenesis. As sperm production declines, Sertoli cells secrete less inhibin, which allows the pituitary to secrete more FSH, and the cycle repeats.
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A sudden increase in pressure within the carotid sinus leads to
a. increased sympathetic nerve activity b. increased parasympathetic nerve activity c. increased cardiac output d. increased peripheral resistance e. none of the above
These ascending (sensory) tracts are the most lateral ones between the dorsal and ventral roots of the spinal cord
A) spinothalamic tracts B) spinocerebellar tracts C) corticospinal tracts D) dorsal white columns
Aldosterone secretion may be stimulated by
A. ADH. B. elevated potassium levels. C. excess water intake. D. elevated sodium levels. E. low potassium levels.
The descending aorta is in the right posterior mediastinum.
Answer the following statement true (T) or false (F)