Which of the following is an organ or part of the male reproductive system?

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An organ that belongs to the male reproductive system is the testes. They are the paired glands that produce sperm, the cells needed for fertilization, and they also secrete testosterone, which helps drive the development of male characteristics and supports fertility. The testes are located in the scrotum, a cooler environment that helps sperm develop properly inside seminiferous tubules. This role is distinct from other organs listed: the heart belongs to the circulatory system, the liver handles metabolism and detoxification, and the brain is the central nervous system. So the testes are the organ that is part of the male reproductive system.