Finally, we're going to talk about reproduction, and by that, I mean to produce offspring. Now every person has only one reproductive system, but it comes in two main flavors, the male reproductive system and the female reproductive system. Let's start with the female reproductive system. The female reproductive system consists of the mammary glands, the ovaries, the uterine tubes, the uterus, and the vagina. And the female reproductive system has a number of jobs to do in order to support reproduction.

First off, it needs to produce eggs, eggs being the gametes or the sex cells that females produce. Next, it needs to receive the sperm so the egg can be fertilized. That fertilized egg will implant in the uterus where the female can support fetal development. Of course, once the baby is developed, there will be birth. And even after birth, the female can support the baby with milk from the mammary glands.

Now in contrast, the male reproductive system consists largely of the testes, the ductus deferens, those are the tubes that connect the testes to the urethra, the prostate gland, and the penis. The male reproductive system really has one job, and that is to produce and deliver sperm to the female, and that's the reproductive system. Now at this point, I think it's important to pick your favorite organ system and to be able to defend why it is your favorite. Now that's unlikely to be a test question, though I used to ask it on my tests, but it's fun to talk about. I bring this up here because my favorite organ system is the reproductive system.

That's because of all the different organ systems, it's the only one where there are fundamental differences between people. And think about your life. How much of your life in some way was based on the reproductive system that you were born with? Now in contrast, you don't need a reproductive system. Of course, people need reproductive systems for there to be people on earth, but you personally can live without one.

Plenty of people have their reproductive systems largely removed, whether it's due to cancer or other reasons, and they go on to live normal lives. That contrast, a system that you don't need and yet dominates so many aspects of our life, I find that forever fascinating. Now maybe your favorite system is the digestive system because you really love cookies. That's defensible as well. With that, we have finished our tour of the organ systems, and I just want to say, good job everybody.