Which organ is NOT part of the male reproductive system?

The uterus is not part of the male reproductive system because it is a female reproductive organ. Its primary function is to support pregnancy and facilitate childbirth. In contrast, the other options mentioned—testes, prostate gland, and seminal vesicles—are all components of the male reproductive system. The testes produce sperm and hormones like testosterone; the prostate gland contributes to seminal fluid formation, aiding in sperm transport; and the seminal vesicles produce a fluid that nourishes sperm and helps form semen. Understanding the distinct roles and anatomical differences between male and female reproductive systems is key to recognizing which organs belong to each system.