In male anatomy, what is the function of the ejaculatory duct?

The function of the ejaculatory duct is to transport seminal fluid mixed with sperm from the seminal vesicles and the vas deferens to the urethra. This structure serves as a conduit through which sperm and seminal fluid are combined before ejaculation. During ejaculation, these fluids are expelled from the body through the urethra, thus playing a crucial role in male reproductive functions.

The other functions mentioned, such as transporting sperm from the testes, regulating blood flow, or storing sperm cells, are performed by different structures. For instance, sperm are transported from the testes via the vas deferens, blood flow regulation is primarily handled by vascular structures surrounding the penis, and storage of sperm cells occurs mainly in the epididymis. Hence, the correct answer accurately captures the specific role of the ejaculatory duct in the male reproductive system.