Final answer:
After three weeks of taking testosterone injections, you would expect to observe increased sex drive, decreased levels of LH and FSH, and decreased levels of GnRH.
Step-by-step explanation:
When a male bodybuilder starts taking daily injections of testosterone, it can have several effects on the body. After 3 weeks, you would expect to observe all of the following:
- Increased sex drive: Testosterone is known to increase libido in males.
- Decreased levels of LH and FSH: The increased levels of testosterone in the body can inhibit the production of LH and FSH by the hypothalamus and pituitary.
- Decreased levels of GnRH: Testosterone can also inhibit the synthesis and secretion of GnRH.
Therefore, the correct answer is D) all of the above.