Sperm In Teen Pussy

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Transport of sperm via erection and ejaculation
Practice: Reproductive system questions
Practice: Reproductive system questions 2
Anatomy of the male reproductive system
Transport of sperm via erection and ejaculation
Reproductive cycle graph - Follicular phase
Reproductive cycle graph - Luteal phase
when the sperm enters the female why dosn't the female immune system kill the sperm cells
Interesting question!

I looked up some information on this and found that usually the female immune system will be inhibited by immunosuppresive components found in the seminal plasma, which is part of semen. This protects the sperm from being attacked by inhibiting most components of the immune system, such as complement.

However, these seminal components can be picked up by macrophages/dendritic cells and can lead to an inflammatory response. In most cases, though, this response does not last long and the sperm is able to escape and fertilize an egg if present.
I am sure there are cases where the immune system will fully attack the sperm and result in an all-out immune response if recognition happens quick enough, but this is likely very rare.

Hope that helps! :)
I thought that nor epinephrine stimulated the sympathetic (fight or flight) system. Why does the sympathetic system keep the penis flaccid then?
You can kind of think of it this way:
So the Sympathetic nervous system (SNS) uses Epinephrine and Norepinephrine (NE) to shunt blood to places where its most needed (so lots of vasoconstriction going on). At times of great stress, you want blood in your skeletal muscle to be ready to move, and your blood pressure, breathing and heart rate to increase, etc. Your body isn't concerned with extra blood in your penis because its not essential for staying alive at that moment. That's why NE is used to inhibit an erection. On the other hand, Nitric Oxide (NO) is used via the Parasympathetic Nervous System to create an erection. The end of the video does get a little confusing when he mentions that NE is used for ejaculation, but remember that the SNS = vasoconstriction! So the SNS will send that signal of NE close to ejaculation to constrict those vessels to prepare to expel the semen out.
I hope that helps explain it from another perspective :)
So, just to clarify the concept, would something like Viagra contain nitric oxide to cause erection?
So lets say there is a pair of male twins named Miles and Joe. And a pair of female twins called Margo and Kate. So they grow up, and Mark marries Margo and Joe marries Kate. So if Mark and Margo have a girl would they be identical to Joe and Kate’s girl?
Technically the girls would be cousins. Their fathers as a pair and mothers as a pair share identical DNA though, so genetic the girls would share the same % of DNA as sisters would.

They would however never be identical. Just like children born to one set of parents (who have the same DNA as them selfs) are never identical unless they are identical twins. Think groups of siblings they can be a lot alike, but they will never be exactly the same.
Could you please clarify whether it is Nitrus Oxide from the Parasympathetic nervous system or Norepinephrine from the Sympathetic nervous system that is released to cause an erection? The answers below are not clear and do not clearly state which stimulating hormones are responsible and from what part of the nervous system. It would be great if Vishal Purwani himself could actually clarify this question thoroughly.
NE is responsible for constricting vessels.
1) by contricting the BLOODvessels it hinders blood from entering these vessels, hence the flacid state.
2) When there is an erection and it's time for the ejaculation, NE is produced --> it once again constricts vessels (this time the vas deferens, the different glands and a few muscles) to shoot the semen out --> ejaculation.

You are correct in saying that NO causes the erection (NO causes vessels to dilate, one of the reasons it is used in e.g. agina pectoris) but to actually cause ejaculation. the vessels need to constrict. Thats where NE comes in play.
Where does the blood come from when a female gets her period?
It comes from the shedding of the lining of the endometrium.
@Sneha, what you said is correct. However, the SNS/PNS play different roles in ERECTION and EJACULATION. In order to cause an ERECTION, the PNS is responsible. So when NO is released from a Parasympathetic neuron onto the arterioles and vessels of the penis, you get vasodilation and engorgement which results in an erection. Similarly, when NE is released from a sympathetic post neuron, you get vasoconstriction of the spinchters around the arteries decreasing blood flow to the penis and resulting in a flaccid/non-erect penis. Here's where things can get confusing. For EJACULATION, the SNS (sympathetic nervous system) is responsible for emission of sperm and not the PNS. So when NE is released from the SNS, you get contraction of the muscles around the vas deferens, etc, while NO from the PNS will inhibit this.
Does urine and semen come out of the same "hole" in the penis or different?
Yes they both exit through the urethral orifice at the distal end of the penis.
isn't an orgasm and an erection basically the same thing?
An orgasm is a climax of sexual excitement, characterized by feelings of pleasure centered in the genitals and (in men) experienced as an accompaniment to ejaculation. An erection is a physiological phenomenon in which the penis becomes firmer, engorged and enlarged. I hope this helps!
so we're gonna talk about the transport of sperm and I just mean how it gets transported out of the male reproductive tract and into the female reproductive tract where it can hopefully fertilize an egg and result in a pregnancy and so to do this we're gonna first look at a sagittal view of the male reproductive system and and I'll just show you what a sagittal view is basically it's if we were to look at this blue guy over here and if we said this is his left side and this is his right side we would we would make a cut down his midline like so and we would sort of cut away everything on one of the sides and in this case we're gonna cut away everything on his left side and then we're gonna look here's an eye here we're gonna sort of look at his his right side of this cut surface on the right side here and so when we do that we find that we see something something like that and so this is what we call a sagittal view and just to remind you this would be is right leg and so the bottom line is that sperm needs to be transported out of our bodies and so we do that in males via a two-step process and the first step is called erection an erection is basically when the penis goes from having very little blood within its core a state called flaccidity and I'll write that out to a state where it's filled with blood and we call that an erection when it's filled with blood and the second step in our two-step process is called ejaculation and so ejaculation is basically the expulsion of sperm out of the reproductive tract so let's go into the mechanisms of how this happens but before we talk about how an erection happens let's let's briefly discuss why an erection happens actually let's just clear off some of this stuff here so believe it or not an erection actually starts in your brain and so here we have a brain and so when you're physically or mentally sexually stimulated by sights or sounds or or smells or even thoughts your brain sends signals to your penis and it can cause an erection so it does that by sending signals to the blood vessels in the penis and those signals causes those blood vessels to open up and allow blood into the penis so it's this filling of the penis with blood which results in an erection and will expand on that in a moment but first we'll talk about some regional anatomy of the penis so the base of the penis here that's called the base or the root this area here is known as the body and this area here is called the head or the glans and so what we'll do next is look at a more detailed view of the anatomy of the inside of the penis the best way to visualize that is if we did something called a transverse view transverse view is basically a cut that goes this way across the penis we'll put our little eye here and we'll look up at this cut surface here and so when we do that you'll find that it looks something like this and so again this is called a transverse view so just to orient you this transverse view is of two different penises side by side so the one on the left is a flaccid penis it's not filled with blood and you can tell because it's got a lot more visible blue veins which you don't see in erection and over on the right we have an engorged erect penis and you can see the veins have sort of been compressed to the sides so that one's erect and I'll explain all that in a minute so in this view it's quite easy to see the three cylindrical vascular compartments that get filled with blood during an erection and so these vascular compartments or chambers are called the corpora cavernosa and you have two of those one on each side here and the corpus spongiosum which you have down here by the way this is the bottom of the penis the underside and this is the top of the penis and also this structure here in the center this tube is the urethra so blood normally flows into these vascular chambers via both dorsal arteries and cavernosa arteries so so here's a dorsal artery and here's a cavernosa artery here and so when the penis is filling with blood blood actually drains out it leaks out of these cavernosa arteries and into these purple circles that you see called lacunar spaces and these lacunar spaces run the the entire length of these vascular chambers so there are a lot of spaces there for blood to leak out into and that's what causes the penis to get engorged and blood is normally drained out of these chambers by veins with the same name so dorsal veins and cavernous veins but under normal conditions ie when you do not have an erection the the blood flow into the penis equals the blood flow out of the penis so there's no actual net change in erection status and let's just label these here this this one on the left here is flaccid and this one over here on the right is erect and the reason why the one on the left is flaccid is because it has arterioles that are constricted and these red arterioles when they're constricted they don't actually allow much blood into the penis but over here on the right the erect penis is sexually excited and so you can see visually that the arterioles on this side are much more dilated that as they let in a lot more blood and thus can can cause an erection and so what's keeping this penis flaccid what is keeping these arterioles from opening up well it turns out that it has to do with your brain and so normally little chemical signals from the brain called norepinephrine cause the arterioles to stay constricted and so we can see a neuron here leaving the spinal cord and sort of sending a signal to the arteriole to keep it small by the way in neuron is a cell of the nervous system responsible for sending messages but over on the other side on the erect side is an another neural and actually a different type of neuron that actually sends a different signal to the arterioles and results in them opening up and allowing blood into the penis and so the signal that this neuron is sending it's called norepinephrine and what norepinephrine is it's a little chemical signal from a division of the nervous system called the sympathetic nervous system or the SNS and that'll become important later on and the signal that this neuron is sending is n-o or nitric oxide and this neuron is actually from a division of the nervous system called the parasympathetic nervous system or the PS NS and so as these arterioles dilate and allow lots of blood into these into these sinuses here they actually feel so much that they push outward against the edges and compress the venous drainage of the penis and that basically prohibits flaccidity thus it results in an erection and just be complete an erection is reversed when the inflow of blood is stopped and then the veins are then allowed to open up and allow the blood back out of the sinuses and then you go flaccid again and that might happen when the nitric oxide from those green parasympathetic neurons stop being produced and one last thing before we move on you might be thinking this you told us that these arterioles dilate and allow blood into the vascular chambers well what's to stop the penis from sort of filling up indefinitely and we actually have if you look at these yellow circles here the three of them they surround our vascular chambers and they sort of prevent them from over expanding and these wrappings are called the tunica albuginea and they're just sort of a supportive structural tissue okay let's just clear off some of this stuff and move on to the second phase which is ejaculation so we'll start with a definition what is ejaculation ejaculations is the discharge of semen from the penis and you normally discharge about 3 to 5 milliliters per ejaculation and in that 3 to 5 milliliters you actually about 300 million sperm an ejaculation happens when basically a critical level of sexual excitement has been reached so sexual stimulation actually causes nerves in the penis to send chemical signals to the spinal cord and brain and then basically the brain and the spinal cord send messages back to the penis to cause ejaculation and there's two phases to ejaculation in itself so we'll start with our erect penis here because now we're sexually excited and remember now that we're erect we've filled these vascular chambers here with blood so the first part is sympathetic nervous system stimulated remember in red we drew these neurons as sympathetic nervous system neurons and they're gonna release norepinephrine which I'll abbreviate is an e onto all of the following structures the epididymis the vas deferens the accessory glands and the ejaculatory duct which is here sitting inside the prostate gland and so to respond to that norepinephrine these structures that I mentioned here actually contract and emit semen into the beginning part of the urethra now in the second phase the semen is now sitting here at the beginning part of the urethra and the smooth muscle of the urethra itself all along its length and this muscle at the base of the penis called the ball both spongy awesome muscle they then contract and sort of expel the semen from the urethra out of the tip of the urethra called the me ada and that's basically the process of ejaculation now all of these muscular contractions are associated with a feeling of extreme pleasure and actually you also get full-body physiological changes for example you see a decrease in heart rate and blood pressure after ejaculation and in some the process of ejaculation and the whole body physiological changes is called an orgasm
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Medically reviewed by Valinda Riggins Nwadike, MD, MPH — Written by Zawn Villines on November 18, 2020
Pregnancy is possible whenever semen is in or on the vagina. But getting pregnant by wiping is unlikely, especially if the semen is not fresh or only a small amount enters the vagina.
However it happens, if fresh semen enters the vagina of a person who can conceive, pregnancy becomes a possibility.

This article investigates the chances of pregnancy occurring in this way, how to reduce the odds, early signs of pregnancy, and more.
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Image credit: Westend61/Getty Images
Pregnancy is very unlikely if a person wipes semen on the outside of the vagina — the vulva. For pregnancy to happen, semen has to get inside the vagina.
If a person wipes semen inside the vagina, pregnancy could only happen under the following circumstances:
Even if all of these circumstances happen, the likelihood of pregnancy remains low. A healthy 30-year-old has about a 20% chance of becoming pregnant during each menstrual cycle that they have sex without using birth control.
The odds of pregnancy resulting from brief contact with semen are even lower.
This is especially true if the semen has been outside of the body for more than a few seconds. During this time, the sperm inside the semen start to die and may be too weak to swim to an egg.
If someone accidentally comes into contact with semen, such as by sitting on a spot where someone has ejaculated, they can try wiping the semen off with a wet cloth. This can help reduce the risk that the sperm will enter the vagina.
Washing out the inside of the vagina — such as by douching — will not lower the risk and may cause vaginal infections.
If sperm do enter the vagina, and the person wants to prevent pregnancy, the safest strategy is to take Plan B, which is sometimes called the morning-after pill.
In theory, a single sperm is all it takes to get pregnant.
But even in a large amount of semenTrusted Source — such as the quantity in one ejaculation — only a fraction of the sperm are healthy, moving, and sufficiently well-formed to cause a pregnancy.
When a small amount of semen comes into contact with the vulva, the odds of even one sperm entering the vagina and making it all the way to the egg are low. The risk is not zero, but it is close to it.
Someone who is very concerned about getting pregnant might worry when clothing or bedding with a semen stain touches their vulva or even after sitting on a toilet seat.
When the semen is old enough not to be wet or visible, there is no risk of pregnancy.
However, if a person ejaculates near the vagina or a person immediately sits so that their vulva touches a surface where someone else has just ejaculated, there is a possibility of pregnancy.
Plan B contains a high dose of hormones to prevent ovulation or, if ovulation occurs, to reduce the chances of the egg implanting in the uterus. This can prevent pregnancy from happening.

Plan B is not an abortion and cannot cause pregnancy loss in a person who is already pregnant.
Anyone who wants to avoid pregnancy after their vagina has come into contact with semen might consider talking to a healthcare provider about Plan B.
To reduce the risk of becoming pregnant or contracting a sexually transmitted infection:

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