Q: Which structure is NOT a part of the male reproductive system?  

Answer: D

The male reproductive system is composed of several structures that are responsible for producing, storing, and delivering sperm to the female reproductive system. These structures include the prostate, testicles, and spermatic ducts. The prostate is a gland that produces semen, which is a fluid that helps transport sperm. The testicles are responsible for producing sperm, while the spermatic ducts transport the sperm from the testicles to the urethra, where they are expelled during ejaculation. The vestibular bulbs, on the other hand, are a part of the female reproductive system, located at the entrance of the vagina. These bulbs become engorged with blood during sexual arousal, helping to create a barrier that can prevent vaginal penetration. Thus, the correct answer is D) vestibular bulbs, which are not a part of the male reproductive system.

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