Question Video: Stating How Semen and Urine Exit the Male Body | Nagwa Question Video: Stating How Semen and Urine Exit the Male Body | Nagwa

Question Video: Stating How Semen and Urine Exit the Male Body Biology • Third Year of Secondary School

How does semen and urine exit the body?


Video Transcript

How does semen and urine exit the body? (A) Through the ureter. (B) Through the urethra. (C) Through the vas deferens. (D) Through the seminiferous tubule. Or (E) through the bladder.

This question asks about the anatomy of the reproductive and urinary tracts in biological males, so let’s briefly review some of the structures involved here, starting with the reproductive system.

In this diagram showing a side view of some of the key structures in a biological male’s reproductive system, we have outlined the exit path for the sperm cells that eventually exit the body as a part of semen in pink. You might have learned that sperm cells are produced in organs called the testes. In fact, the specific site of sperm production within each testis are long coiled tubes called the seminiferous tubules. The mature sperm cells travel from the seminiferous tubules to a region called the epididymis for their final development and storage. These sperm cells may eventually leave the body through a process called ejaculation.

When ejaculation is anticipated, for example, during sexual arousal, the sperm cells travel from the epididymis into a tube, or duct, called the vas deferens. The vas deferens leads the sperm cells into another duct called the urethra. During its passage through the male reproductive system, several fluids are added to the sperm cells by various glands to make up a fluid called semen. From the urethra, the semen, which contains the sperm cells, can be released from the male body by ejaculation via the penis.

Using the information we have learned so far, we can eliminate answer options (C), through the vas deferens, and (D), through the seminiferous tubule, as semen has not been fully formed until the sperm cells enter the urethra. And these organs also do not play a role in the removal of urine.

Let’s remove some of these labels so we have more space to take a look at how urine exits the body of a biological male. To do this, we have added a few important organs to this diagram and outlined the exit path for urine in blue. Urine is first produced in the kidneys, which have been shown in this front view of the urinary system in males on the right side of the screen. Urine is initially transported from the kidneys to the bladder via two tubes called the ureters. Note that while this sounds similar to urethra, it has an entirely different function as the ureter is not involved in the transport of semen at all, only urine.

With this information, we can eliminate option (A), through the ureter, as this is the tube that transports urine from the kidneys to the bladder, not out of the body. It also does not transport semen.

Urine is stored in the bladder until urination, when urine will travel via the urethra, through the penis, and out of the male’s body. It’s interesting to note that biological females also have a urethra through which urine exits their body, except it does not travel through a penis. Therefore, the answer cannot be (E), through the bladder, as this organ is responsible for storing urine, not transporting it out of the body. Instead, the sperm cells and urine exit the body of a biological male through the same structure, the urethra, suggesting that this is the correct answer to this question. The way that semen and urine exit the body of a biological male is (B) through the urethra.

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