Testosterone (TEST) is regulated via the hypothalamic- anterior pituitary periph

Question

Testosterone (TEST) is regulated via the hypothalamic- anterior pituitary peripheral endocrine gland (testes) axis. Which of the following statement is CORRECT about this axis? a. TEST stimulates release of anterior pituitary hormones b. As TEST levels rise, TEST may inhibit the release of the hypothalamic releasing hormone (in this case GnRH) c. Tropic hormones (LH and FSH) from the anterior pituitary cause TEST secretion from the hypothalamus d. Hypothalamic hormones directly stimulate the testes to secrete TEST e. The precursor to TEST is made by the anterior pituitary, but is completely processed into TEST by the testes What is a major feature of the endocrine system? a. Some hormones are synthesized from triglycerides b. Hydrophobic hormones bind cytoplasmic/intracellular receptors c. All hormones are immediately secreted after being synthesized d. All plasma-membrane hormone receptors work via G-proteins e. Hormone levels are homeostatically regulated If we think of both light and sound stimuli as waves, the amplitude of the wave codes _____ in the auditory system and _____ in the visual system a. Loudness/brightness b. Pitch/brightness c. Pitch/color d. Location/location e. Loudness/contrast

Explanation / Answer

26) Testosterone secretion is regulated through hypothalamic anterior pituitary peripheral endocrine gland axis also known as HPG (hypothalamo pituitary gonadal) axis. HPG axis plays an important role in the development of reproductive and immune systems.

Gonadotropin releasing hormone (GnRH) is secreted from the hypothalamus stimulates anterior pituitary gland to secrete leuteinising hormone (LH) and follicle stimulating hormone (FISH). LH and FSH in turn stimulate testis to produce testosterone. When the testosterone levels in the blood has reached a maximum permissible limit, it inhibits the release of hypothalamic releasing hormone (GnRH). Thus testosterone exerts negative feedback mechanism. Therefore, the answer for this question is option b.

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