Where Does the Egg Go After Ovulation When Can You Tell the Sex of a Baby Biology

Top things to know

• It's much more complicated than "sperm meets egg"

• Simply a tiny fraction of the sperm that entered the vagina make information technology to the fallopian tube

• It takes about half dozen-12 days for the fertilized egg to travel to the uterus and attach to the uterus in a process known equally implantation

This is what most of us learn about how a pregnancy happens:

Sperm meets egg, egg meets uterus, and boom: pregnancy.

While that is the bare bones of how conception works, there'south a lot going on in a person's body that helps—or sometimes hinders—conception.

Here, we'll talk through what different parts of the trunk are doing at different times to prepare for pregnancy when information technology occurs from penis-vagina sex activity or from other forms of insemination, such as artificial insemination. Some of this data might likewise apply to conception that happens with the aid of artificial reproductive technologies (like in-vitro fertilization (IVF)), though we don't straight focus on that topic here.

Exist prepared: bodies, sperm, and eggs do a lot of work to achieve a pregnancy.

Likewise, FYI, a lot of this data is based on animal research, especially events that happen deep in the reproductive tract. Information technology's possible some of this information volition change in the future.

Earlier we begin

Earlier diving into conception, y'all should brush upward on your knowledge of eggs and sperm, and of how ovulation works. Ovulation is when an egg is released from the ovary, and is disquisitional to the whole procedure.

We option upward where ovulation ends.

Earlier sex: how the neck and vagina prepare for pregnancy

The neck is what connects the vagina to the uterine cavity. It has glands that produce cervical fluid (also called cervical mucus), which passes through the vagina. You sometimes might see cervical fluid on your underwear or on toilet paper equally you wipe.

Cervical fluid characteristics change throughout the menstrual cycle (i-three):

• During and merely after your period: You may not observe any cervical fluid.

• Between your period and ovulation: Equally estrogen levels rising, the amount of cervical fluid increases and becomes wetter, thicker and cloudier (two,3).

• Around ovulation: Cervical fluid oftentimes looks like egg white: information technology's sparse, glace, and stretchy (two-4).

And so why does this matter? In short, sperm swim best through moisture and stretchy cervical mucus (three,iv). If this fluid is absent or is thick and viscous, sperm have a hard time passing the cervix (3,four).

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The fourth dimension menses between when cervical fluid is platonic for sperm and ovulation is known as the fertile window.

Finally, sperm accept an effect on the vagina. Commonly the vagina is somewhat acidic, in order to protect against infection (5). When exposed to sperm, the vagina becomes less acidic (1,5).

Earlier the sperm make it: how the uterus prepares for pregnancy

During your menstruum, the uterus sheds the endometrium, which built upwardly during the previous menstrual cycle. Afterwards shedding, the endometrium waits for estrogen (produced in the ovaries) to ascent. Estrogen causes the lining of the uterus to thicken by stimulating the endometrial cells to carve up (ii).

After ovulation, the endometrium prepares for the possible arrival of a fertilized egg. In response to increasing levels of progesterone:

• endometrial cells finish dividing and start growing larger

• the number of arteries increases

• uterine contractions are suppressed (2).

Besides, the rising in progesterone afterward ovulation too signals to the endometrium to release little carbohydrate-filled sacs into the uterus to attend the incoming egg (2).

Sperm try their all-time

If a person has unprotected penis-vagina sex during their fertile window, probably at least some sperm will brand it'due south way through the cervix and into the uterus. (With artificial insemination, sperm is oftentimes introduced directly into the cervix or uterus, so this step is bypassed.)

Although sperm use their tails to swim through cervical mucus in the vagina and neck, it'south actually the uterus that moves sperm through information technology and into the fallopian tubes (1).

Sex activity can cause the brain to release the hormone oxytocin (1,6), which causes the innermost layer of the uterus to contract and push button the sperm onwards (1,v,6). The uterus also has pinkie like structures called cilia that help move the sperm, hopefully, towards the egg (1).

The uterus might not be an entirely prophylactic place for sperm, though.

Sperm triggers an immune response when information technology enters the uterus (5). Once sperm enter, the number of white claret cells increases, and they begin to attack the dying sperm, though information technology'south possible they may also attack good for you sperm likewise (1,five).

Also, sperm may finish upward going up the wrong fallopian tube. The vast majority of the time, a person only releases one egg from one ovary. That ways that only one of the two fallopian tubes will have eggs, and some sperm will take gotten it incorrect.

Only a tiny fraction of the sperm that entered the vagina make it to the fallopian tube (5).

Fertilization: later on sperm go far, the magic happens

The magic happens in the fallopian tubes.

As the fallopian tube pushes the egg towards the uterus, cilia button the sperm towards the egg. Progesterone and estrogen influence this procedure by increasing the number of cilia and how fast they move (1).

The egg and surrounding cells produce a chemic that attracts sperm (1,7). Sperm may be attracted to the temperature at the ovarian-end of the fallopian tube, which tends to be warmer (1,5).

As they travel through the fallopian tubes, sperm gain the power to fertilize an egg (1). They undergo 2 processes: capacitation, where its outer layer is changed, and hyperactivation, which changes the way the sperm's tail moves (i,five).

Although it'due south come and so far and has already inverse, the sperm nonetheless has work to practise: specifically, breaking through the barriers effectually the egg.

To enter the egg, the sperm has to do two things:

1. Break through a group of cells known every bit the cumulus oophorus that surround the egg. The sperm dissolves these cells using an enzyme (1,7).

2. Break through the outer membrane of the egg. The sperm essentially fuses to and digests this membrane using an enzyme (i,7). Once a sperm has penetrated an egg, this membrane changes, and becomes bulletproof to other sperm (1,7).

Now attached, the sperm's nucleus—where the chromosomes are stored—enters the egg cell looking for the egg'due south nucleus (1).

Once it meets the egg, the nuclei from the egg and sperm merge and share their genetic textile (one,7).

If all this goes well, what fertilized egg becomes a zygote (1,vii). The egg now contains all the genetic cloth it will need to become a person.

Implantation: what happens after the egg is fertilized

Information technology takes near 6-12 days for the fertilized egg to travel to the uterus and attach to the uterus in a process known as implantation (one,8). The egg is pushed dorsum towards the uterus past the cilia (1). The egg must adhere to the uterus to get a feasible pregnancy.

While traveling to the uterus, the egg has been dividing and forming a few different structures (7).

Once it's big enough *and* in the uterus, the egg transitions from beingness known as a zygote to being called a blastocyst (1).

When does a pregnancy officially brainstorm?

When the uterus detects the blastocyst, information technology releases enzymes to break downwards the blastocyst's outer membrane.

In one case that barrier is cleaved down, the blastocyst can attach to the endometrium (1).

This is when a pregnancy officially begins.

It'due south a complicated procedure

Sometimes, though, a fertilized eggs can't make information technology to implantation.

For every 10 fertilized eggs, between iv and 6 won't make it to implantation (9,x).

These losses generally aren't considered miscarriages, as most healthcare professionals consider a pregnancy to have begun at implantation. However, people who call back or know they lost a fertilized egg (such as people using artificial reproductive technologies) may consider this to be akin to a more traditional miscarriage.

[We write nearly miscarriage here and here .]

As you can see, in that location's a lot of steps in this process, and if whatever of them don't go exactly right, pregnancy may not occur.

Sometimes, the egg attaches somewhere else, similar to the fallopian tube, and the pregnancy will not be viable. This is called an ectopic pregnancy and should exist treated as a medical emergency.

Although it can become wrong, it'due south pretty astonishing how often our bodies do get information technology correct.

Article originally published 29 June 2019.

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Source: https://helloclue.com/articles/sex/conception-pregnancy-fertilization-explained

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