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Sperm Path and Ejaculation

So we are going to talk about all of the physical changes that happen for boys in the reproductive system. That means we're going to be learning about the path of the sperm as it leaves the body. Now, when sperm leaves the body, it has a special name. It's called an ejaculation or to ejaculate. But first we have to look at where sperm is produced in the male body. So, sperm is produced in the testes. Now testes are these round parts between a man's legs. In this picture, you can only see one of them. Now, the testes, during puberty, start to grow larger. And, in fact, they usually start to grow before the penis grows. And one usually starts to grow before the other. In the end, one usually ends up being a little lower than the other. That's so when a person is walking they wouldn't bump into each other. That's where sperm starts to grow. They usually end up being about the size of a large grape. Now, testes produce sperm at about 4,000 sperm per second. So, every grown male on the planet is producing 4,000 sperm. Where does it all go? Well, some it is absorbed back into the testes. And some of it leaves the body. Now sperm looks like this. It has a tail. Sperm grows its tail in this part of the body right here, which is called the epididymus. The epididymus is where sperm matures. Now the epidydumus, if we look at it very closely is a bunch of tubes that are all coiled up together on the back of the testes and if we were to untangle it, it would be about 25 feet long, about the size of an average classroom. Sperm grows its tail in the epididymus. Why do you think sperm has a tail? Yea, tails are for swimming or moving. Sperm needs to be able to move so that if it were, say, in a female body, it would move toward an egg, which could cause a pregnancy. Now, if sperm is going to leave the body during an ejaculation, this is what happens: the sperm that's mature heads up this tube, which is called the vas deference. Then, in order to get out of the body, sperm, essentially millions of them that come out at every ejaculation. It needs some fluid around it in order to help it get out of the body. And it picks up some of that fluid at this first gland, right here. That glad is called the seminal vesicle. The seminal vesicle makes a lot of sugary liquid. We'll call it a sugary snack bar. It is where it gets the juice that's going to give it energy. Right? When you eat sugar, it gives you energy. That's what sperm get, too, when they pick up this fluid from the seminal vesicle. Then, in order to get more fluid, they stop at this next gland here, which is called the prostate gland. Then the seminal vesicle fluid and thee prostate gland fluid join with the sperm and head out through this tube inside the penis, which is called the urethra. Now, Oh! I forgot to tell you something! Here's an important fact: do you think that sperm could leave this body while the penis is relaxed or does it have to be erect? That's right, it has to have an erection. All an erection is when a lot of blood rushes into the penis so it gets hard and sticks out from the body. So, that's actually the first thing that has to happen. And after the erection happens, the next thing that happens is that there is a little gland right here that makes a fluid that cleans out the pee that's inside that tube in the penis. Because sperm doesn't like pee. See, if sperm were to run into pee, pee is kind of acidic so it would kill the sperm. So, this little gland called the Caulper's glad makes a fluid to clean that out. Then the path of the sperm leaving the body is ready to go. When sperm leaves the body, we call it semen. It comes out at about 28 mph. Sometimes even 32 mph, which is faster than you can walk. That's the path of the sperm. A couple of things that are important to know: up here there is the bladder. What is in the bladder? Pee. Almost everyone knows at this point that pee can come out of a penis. Most boys go to the bathroom a couple of times a day. What's important to know is that after puberty, semen can also come out of a penis. But you can only do one or the other. You can either pee or ejaculate, you can't do both at the same time because there is a little valve in here and as soon as someone gets an erection it says "nope, no pee is coming out now." So, that's an important point to know.






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